Description:
Mac has changed to use the clang/clang++ compilers but compiler settings for production, debug and profile
were not setup.
Solution:
Setup default values for PROD_CFLAGS, PROD_CPPFLAGS, DEBUG_CFLAGS, DEBUG_CPPFLAGS.
PROFILE_CFLAGS and PROFILE_CPPFLAGS were set too but clang does not -pg or such for
profiling. Need to fix it later.
Tested: duck, swallow, and quail using --enable-production.
cbd0112b16