Merged in new upstream version of the maxopt autotools macros that fixes the…
Merged in new upstream version of the maxopt autotools macros that fixes the problem or erasing the CFLAGS.
See http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=commitdiff;h=73ee1b396c21062ee8eeb8721ba5323322110fb5 for the upstream commit.
This allows us to remove the workaround that was built into our configure script.