Support cflags_c and cflags_cc in the Makefile generator.
Support cflags_c and cflags_cc in the Makefile generator.

This allows you to pass flags specific to just C or C++ compilation.
This should make the current behavior of the SCons generator.

Review URL: http://codereview.chromium.org/132017
Patch from Dean McNamee <deanm@chromium.org>.
witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp,witwall/gyp