Add some more autoconf macros to filter our CFLAGS usage

Hopefully these new autoconf macros, with a little magic, will allow us to
compile with any compiler and still choose the options we have available
to us.

Tested locally with gcc 4.2.2 and gcc 3.4.6; the latter doesn't support two
of the items we previously had hardcoded in our CFLAGS.

Signed-off-by: Dan McGee <dan@archlinux.org>

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