cctools : Add MinGW-w64 CXXFLAGS

-D__USE_MINGW_ANSI_STDIO=1 -D_POSIX -D_POSIX_C_SOURCE needed
add some env.sh exclusions for MinGW-w64

.. namely any with ()'s, !; and ASL.LOG. This allows
us to continue at different stages on MSYS\MinGW-w64.