Add a test for libatomic_ops minimal version required (at compile time).
Merge symbian branch to master.
-Merge useful code (if any) from gcc_boehmgc branch.
Merge useful code (if any) from mono_libgc branch.
windows-untested: Remove if CMake can generate MS Visual Studio 6.0, 7.0, 8.0
build_atomic_ops.sh[.cygwin]: Remove if really not needed.
-Mac_files: Remove MacOS_config.h, MacOS_Test_config.h.
-
-configure: Add cordtest.c to tests.am.
-
FIXME tasks
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