Push final collection of CFLAGS/LDFLAGS from Makefile.config to Makefile.local

Push final collection of CFLAGS/LDFLAGS from Makefile.config to Makefile.local

This makes the final decision more explicit closer to where the flags
are actually being used. This will be helpful as we add other
programs, which can now easily mimic the style of flags collection as
is done for fips.

This also eliminates any potential confusion of FIPS_FLAGS
vs. FINAL_FIPS_FLAGS, etc. The use of "FINAL_" has now been entirely
eliminated.