AM_PROG_AS default to $CC directly

[Kevin Ryde]

I'd like to propose the following.  The test/set style follows
autoconf recommendations.

        * m4/as.m4 (AM_PROG_AS): Let CCAS and CCASFLAGS default to the actual
        values of $CC and $CFLAGS (as opposed to $(CC) and $(CFLAGS)), so
        configure tests can use them.  Add AC_ARG_VAR.

I guess anyone relying on "make CC=foo" to also change CCAS will be
disappointed, but if CCAS is to have an independent existence then
it's probably a good thing for it to not be changed by "make CC=foo".

as.m4.diff
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