Streamline git ignores

Many entries were from before the move to git, others before the move
to cmake.

.gitignore

@@ -24,65 +24,17 @@ CMakeCache.txt
 CMakeLists.txt.user
 DartConfiguration.tcl
 .DS_Store
-macros/libtool.m4
-macros/ltoptions.m4
-macros/ltsugar.m4
-macros/ltversion.m4
-macros/lt~obsolete.m4
+bin
+lib
 tags
-test-driver
-tests/thread/badthreadtest
-tests/thread/threadtest
-tests/unit/geos_unit
-tests/xmltester/SimpleWKTTester
-tests/xmltester/XMLTester
-tests/xmltester/testrunner
 tools/geos.pc
 tools/geos-config
-tools/astyle/astyle
-tests/bigtest/TestSweepLineSpeed
-tests/bigtest/bug234
-tests/geostest/geostest
-benchmarks/algorithm/InteriorPointAreaPerfTest
-benchmarks/algorithm/UnaryUnionSegmentsPerfTest
-benchmarks/algorithm/VoronoiPerfTest
-benchmarks/capi/GEOSPreparedContainsPerfTest
-benchmarks/capi/IntersectionPerfTest
-benchmarks/capi/memleak_mp_prep
-benchmarks/capi/UnaryOpPerfTest
-benchmarks/operation/buffer/IteratedBufferStressTest
-benchmarks/operation/predicate/RectangleIntersectsPerfTest
-benchmarks/ClassSizes
-include/config.h.in~
-include/geos/platform.h
-include/geos/platform.h.disabled
-include/geos/stamp-h2
 include/geos/version.h
-include/stamp-h1
-install-sh
-compile
-libtool
-ltmain.sh
-missing
-py-compile
-autom4te.cache/
 capi/geos_c.h
-config.guess
-config.log
-config.status
-config.sub
-depcomp
-doc/Doxyfile
-doc/example
-doc/doxygen_docs
-include/config.h
-include/config.h.in
-authors.git
 !/docker/**/README
 !/docker/**/Makefile
 /.vs*
 .idea/
 .project
-out/
 .ccache/
 web/public/