Add a test for libatomic_ops minimal version required (at compile time).
-Merge symbian branch to master.
-
windows-untested: Remove if CMake can generate MS Visual Studio 6.0, 7.0, 8.0
project files.
build_atomic_ops.sh[.cygwin]: Remove if really not needed.
+BCC_MAKEFILE, EMX_MAKEFILE, OS2_MAKEFILE, PCR-Makefile, WCC_MAKEFILE,
+SMakefile.amiga, Makefile.dj, digimars.mak: move to "build" folder.
+
Do type-punning via union (instead of pointer type cast) to enable safe
'-fstrict-aliasing' compiler optimization option.