Fix relro, now and PIE for host and libraries

[janvorli]

The former core-setup and corefx native code build was missing the
-z,relro and -z,now options and also the position independent related
-pie linker option. This change fixes that by adding the missing options
and using the native cmake position independent code support instead
of passing the respective compiler and linker options explicitly.

Close #632

[janvorli]

cc: @jeffschwMSFT, @lpereira

[safern]

It seems like this PR broke the Debug build of libraries WebAssembly.

CMake Warning at CMakeLists.txt:11 (message):
PIE is not supported at link time: PIE (C): shared:INFO: (Emscripten:
Running sanity checks)

wasm-ld: /b/s/w/ir/cache/builder/emscripten-releases/llvm-project/llvm/include/llvm/Support/Casting.h:264: typename cast_retty<X, Y >::ret_type llvm::cast(Y ) [X = lld::wasm::FunctionSymbol, Y = const lld::wasm::Symbol]: Assertion `isa(Val) && "cast() argument of incompatible type!"' failed.
Stack dump:
0. Program arguments: /__w/32/b/emsdk/upstream/bin/wasm-ld -o System.Native.bc --allow-undefined --lto-O0 CMakeFiles/System.Native-Static.dir/pal_console.c.o CMakeFiles/System.Native-Static.dir/pal_errno.c.o -L/__w/32/b/emsdk/upstream/emscripten/system/local/lib CMakeFiles/System.Native-Static.dir/pal_interfaceaddresses.c.o -L/__w/32/b/emsdk/upstream/emscripten/system/lib CMakeFiles/System.Native-Static.dir/pal_io.c.o -L/__w/32/b/emsdk/.emscripten_cache/wasm-obj CMakeFiles/System.Native-Static.dir/pal_maphardwaretype.c.o CMakeFiles/System.Native-Static.dir/pal_memory.c.o CMakeFiles/System.Native-Static.dir/pal_mount.c.o CMakeFiles/System.Native-Static.dir/pal_networking.c.o CMakeFiles/System.Native-Static.dir/pal_networkstatistics.c.o CMakeFiles/System.Native-Static.dir/pal_process.c.o CMakeFiles/System.Native-Static.dir/pal_random.c.o CMakeFiles/System.Native-Static.dir/pal_runtimeinformation.c.o CMakeFiles/System.Native-Static.dir/pal_runtimeextensions.c.o CMakeFiles/System.Native-Static.dir/pal_signal.c.o CMakeFiles/System.Native-Static.dir/pal_string.c.o CMakeFiles/System.Native-Static.dir/pal_tcpstate.c.o CMakeFiles/System.Native-Static.dir/pal_time.c.o CMakeFiles/System.Native-Static.dir/pal_uid.c.o CMakeFiles/System.Native-Static.dir/pal_datetime.c.o CMakeFiles/System.Native-Static.dir/pal_sysctl.c.o CMakeFiles/System.Native-Static.dir/__w/32/s/artifacts/obj/_version.c.o --import-memory --import-table -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export __wasm_call_ctors --export __data_end --export main --export malloc --export free --export setThrew --export __errno_location --export fflush -z stack-size=5242880 --initial-memory=16777216 --no-entry --max-memory=16777216 --global-base=1024 --relocatable
#0 0x00007ff2192330b4 PrintStackTraceSignalHandler(void) (/__w/32/b/emsdk/upstream/bin/../lib/libLLVM-10svn.so+0x7000b4)
#1 0x00007ff219230e3e llvm::sys::RunSignalHandlers() (/__w/32/b/emsdk/upstream/bin/../lib/libLLVM-10svn.so+0x6fde3e)
#2 0x00007ff219233368 SignalHandler(int) (/__w/32/b/emsdk/upstream/bin/../lib/libLLVM-10svn.so+0x700368)
#3 0x00007ff21c1b9390 __restore_rt (/lib/x86_64-linux-gnu/libpthread.so.0+0x11390)
#4 0x00007ff217efd428 raise /build/glibc-LK5gWL/glibc-2.23/signal/../sysdeps/unix/sysv/linux/raise.c:54:0
#5 0x00007ff217eff02a abort /build/glibc-LK5gWL/glibc-2.23/stdlib/abort.c:91:0
#6 0x00007ff217ef5bd7 __assert_fail_base /build/glibc-LK5gWL/glibc-2.23/assert/assert.c:92:0
#7 0x00007ff217ef5c82 (/lib/x86_64-linux-gnu/libc.so.6+0x2dc82)
#8 0x00000000006e19f0 lld::wasm::GlobalSection::writeBody() (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x6e19f0)
#9 0x00000000006d22aa lld::wasm::SyntheticSection::finalizeContents() (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x6d22aa)
#10 0x00000000006cc638 (anonymous namespace)::Writer::run() (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x6cc638)
#11 0x00000000006c51a1 lld::wasm::writeResult() (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x6c51a1)
#12 0x00000000006a79bd (anonymous namespace)::LinkerDriver::link(llvm::ArrayRef<char const>) (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x6a79bd)
#13 0x00000000006a24d8 lld::wasm::link(llvm::ArrayRef<char const*>, bool, llvm::raw_ostream&) (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x6a24d8)
#14 0x000000000041f45b main (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x41f45b)
#15 0x00007ff217ee8830 __libc_start_main /build/glibc-LK5gWL/glibc-2.23/csu/../csu/libc-start.c:325:0
#16 0x000000000041efe9 _start (/__w/32/b/emsdk/upstream/bin/wasm-ld+0x41efe9)
shared : error : '/__w/32/b/emsdk/upstream/bin/wasm-ld -o System.Native.bc --allow-undefined --lto-O0 CMakeFiles/System.Native-Static.dir/pal_console.c.o CMakeFiles/System.Native-Static.dir/pal_errno.c.o -L/__w/32/b/emsdk/upstream/emscripten/system/local/lib CMakeFiles/System.Native-Static.dir/pal_interfaceaddresses.c.o -L/__w/32/b/emsdk/upstream/emscripten/system/lib CMakeFiles/System.Native-Static.dir/pal_io.c.o -L/__w/32/b/emsdk/.emscripten_cache/wasm-obj CMakeFiles/System.Native-Static.dir/pal_maphardwaretype.c.o CMakeFiles/System.Native-Static.dir/pal_memory.c.o CMakeFiles/System.Native-Static.dir/pal_mount.c.o CMakeFiles/System.Native-Static.dir/pal_networking.c.o CMakeFiles/System.Native-Static.dir/pal_networkstatistics.c.o CMakeFiles/System.Native-Static.dir/pal_process.c.o CMakeFiles/System.Native-Static.dir/pal_random.c.o CMakeFiles/System.Native-Static.dir/pal_runtimeinformation.c.o CMakeFiles/System.Native-Static.dir/pal_runtimeextensions.c.o CMakeFiles/System.Native-Static.dir/pal_signal.c.o CMakeFiles/System.Native-Static.dir/pal_string.c.o CMakeFiles/System.Native-Static.dir/pal_tcpstate.c.o CMakeFiles/System.Native-Static.dir/pal_time.c.o CMakeFiles/System.Native-Static.dir/pal_uid.c.o CMakeFiles/System.Native-Static.dir/pal_datetime.c.o CMakeFiles/System.Native-Static.dir/pal_sysctl.c.o CMakeFiles/System.Native-Static.dir/__w/32/s/artifacts/obj/_version.c.o --import-memory --import-table -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export __wasm_call_ctors --export __data_end --export main --export malloc --export free --export setThrew --export __errno_location --export fflush -z stack-size=5242880 --initial-memory=16777216 --no-entry --max-memory=16777216 --global-base=1024 --relocatable' failed (-6) [/__w/32/s/src/libraries/Native/build-native.proj]
##[error]shared(0,0): error : (NETCORE_ENGINEERING_TELEMETRY=Build) '/__w/32/b/emsdk/upstream/bin/wasm-ld -o System.Native.bc --allow-undefined --lto-O0 CMakeFiles/System.Native-Static.dir/pal_console.c.o CMakeFiles/System.Native-Static.dir/pal_errno.c.o -L/__w/32/b/emsdk/upstream/emscripten/system/local/lib CMakeFiles/System.Native-Static.dir/pal_interfaceaddresses.c.o -L/__w/32/b/emsdk/upstream/emscripten/system/lib CMakeFiles/System.Native-Static.dir/pal_io.c.o -L/__w/32/b/emsdk/.emscripten_cache/wasm-obj CMakeFiles/System.Native-Static.dir/pal_maphardwaretype.c.o CMakeFiles/System.Native-Static.dir/pal_memory.c.o CMakeFiles/System.Native-Static.dir/pal_mount.c.o CMakeFiles/System.Native-Static.dir/pal_networking.c.o CMakeFiles/System.Native-Static.dir/pal_networkstatistics.c.o CMakeFiles/System.Native-Static.dir/pal_process.c.o CMakeFiles/System.Native-Static.dir/pal_random.c.o CMakeFiles/System.Native-Static.dir/pal_runtimeinformation.c.o CMakeFiles/System.Native-Static.dir/pal_runtimeextensions.c.o CMakeFiles/System.Native-Static.dir/pal_signal.c.o CMakeFiles/System.Native-Static.dir/pal_string.c.o CMakeFiles/System.Native-Static.dir/pal_tcpstate.c.o CMakeFiles/System.Native-Static.dir/pal_time.c.o CMakeFiles/System.Native-Static.dir/pal_uid.c.o CMakeFiles/System.Native-Static.dir/pal_datetime.c.o CMakeFiles/System.Native-Static.dir/pal_sysctl.c.o CMakeFiles/System.Native-Static.dir/__w/32/s/artifacts/obj/_version.c.o --import-memory --import-table -mllvm -combiner-global-alias-analysis=false -mllvm -enable-emscripten-sjlj -mllvm -disable-lsr --export __wasm_call_ctors --export __data_end --export main --export malloc --export free --export setThrew --export __errno_location --export fflush -z stack-size=5242880 --initial-memory=16777216 --no-entry --max-memory=16777216 --global-base=1024 --relocatable' failed (-6)

Example: https://dev.azure.com/dnceng/public/_build/results?buildId=453500