mono/mono — pull request #1378 by ajlennon (2014-10-29 17:34:53+00:00)
Title: [libgc] Eliminate warning about redefinition of GC_WIN32_THREADS

Makefile defines GC_WIN32_THREADS as 1 but gc_config_macros was
redefining as defined but with no value.

Signed-off-by: Alex J Lennon