Upgrade uvwasi to 0.0.12

[axic]

This allows removing two workarounds needed for earlier uvwasi versions.

[axic]

Damn:

[53/55] Linking C static library _deps/libuv-build/libuv_a.a
[54/55] Linking C static library libuvwasi_a.a
[55/55] Linking C shared library libuvwasi.so
FAILED: libuvwasi.so 
: && /usr/bin/cc -fPIC    -shared -Wl,-soname,libuvwasi.so -o libuvwasi.so CMakeFiles/uvwasi.dir/src/clocks.c.o CMakeFiles/uvwasi.dir/src/fd_table.c.o CMakeFiles/uvwasi.dir/src/path_resolver.c.o CMakeFiles/uvwasi.dir/src/poll_oneoff.c.o CMakeFiles/uvwasi.dir/src/uv_mapping.c.o CMakeFiles/uvwasi.dir/src/uvwasi.c.o CMakeFiles/uvwasi.dir/src/wasi_rights.c.o CMakeFiles/uvwasi.dir/src/wasi_serdes.c.o  _deps/libuv-build/libuv_a.a  -lpthread  -ldl  -lrt && :
/usr/bin/ld: _deps/libuv-build/libuv_a.a(threadpool.c.o): relocation R_X86_64_32S against `.bss' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(uv-common.c.o): relocation R_X86_64_32S against `.data' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(uv-data-getter-setters.c.o): relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(core.c.o): relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(fs.c.o): relocation R_X86_64_32S against `.rodata' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(process.c.o): relocation R_X86_64_32S against `.rodata.cst8' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(random-devurandom.c.o): relocation R_X86_64_32S against `.bss' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(signal.c.o): relocation R_X86_64_32S against `.data' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(stream.c.o): relocation R_X86_64_32S against `.rodata.cst16' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(tcp.c.o): relocation R_X86_64_32S against `.rodata.cst8' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(thread.c.o): relocation R_X86_64_32S against `.bss' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(tty.c.o): relocation R_X86_64_32S against `.data' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(udp.c.o): relocation R_X86_64_32S against symbol `in6addr_any@@GLIBC_2.2.5' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(proctitle.c.o): relocation R_X86_64_32S against `.bss' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(linux-core.c.o): relocation R_X86_64_32S against `.data' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(epoll.c.o): relocation R_X86_64_32S against `.bss' can not be used when making a shared object; recompile with -fPIC
/usr/bin/ld: _deps/libuv-build/libuv_a.a(random.c.o): warning: relocation in read-only section `.text'
clang: error: linker command failed with exit code 1 (use -v to see invocation)
ninja: build stopped: subcommand failed.

It builds on macOS 😞

[codecov]

Codecov Report

Merging #802 (349d82c) into master (600ca56) will decrease coverage by 0.01%.
The diff coverage is 100.00%.

❗ Current head 349d82c differs from pull request most recent head 514df4f. Consider uploading reports for the commit 514df4f to get more accurate results

@@            Coverage Diff             @@
##           master     #802      +/-   ##
==========================================
- Coverage   99.12%   99.10%   -0.02%     
==========================================
  Files          81       81              
  Lines       12985    12934      -51     
==========================================
- Hits        12871    12818      -53     
- Misses        114      116       +2     

Flag	Coverage Δ
rust	99.90% <ø> (ø)
spectests	?
unittests	?
unittests-32	99.03% <100.00%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
tools/wasi/uvwasi.cpp	57.89% <100.00%> (-11.34%)	⬇️
test/testfloat/testfloat.cpp	95.86% <0.00%> (-1.38%)	⬇️
test/unittests/execute_floating_point_test.cpp	99.70% <0.00%> (-0.02%)	⬇️
lib/fizzy/execute.cpp	99.29% <0.00%> (-0.01%)	⬇️
test/unittests/instantiate_test.cpp	100.00% <0.00%> (ø)
test/unittests/floating_point_utils_test.cpp	100.00% <0.00%> (ø)