[libatomic] Always compile atomic builtin tests with $XCFLAGS (PR other/53284)

[Rainer Orth]

As described in the PR, several 32-bit libatomic tests FAIL on
Solaris/x86 with infinite recursion e.g. in
__atomic_compare_exchange_8.  It turns out that this happens because,
unlike on glibc targets, the atomic builtin configure tests are run as
compile tests, but are currently not compiled with $XCFLAGS, unlike the
real code.  The following patch fixes this, tested on
i386-pc-solaris2.10 and x86_64-unknown-linux-gnu, approved by rth in the
PR, installed on mainline.

	Rainer


2012-05-09  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR other/53284
	* acinclude.m4 (LIBAT_TEST_ATOMIC_BUILTIN): Add -O0 -S to CFLAGS
	instead of overriding.
	* configure: Regenerate.

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Rainer Orth, Center for Biotechnology, Bielefeld University