[v3, build] Restrict -Wa,-nH use to Solaris (PR libstdc++/55594)

[Rainer Orth]

As reported in the PR, the AIX assembler also accepts the -nH option,
but with completely different semantics.  To avoid this, the current
patch restricts checking the option to Solaris targets.

Bootstrapped without regressions on i386-pc-solaris2.10 with Sun as
(-Wa,-nH is added), x86_64-unknown-linux-gnu (test no longer performed),
tested on AIX by David.

Ok for mainline?

	Rainer


2013-01-06  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	PR libstdc++/55594
	* acinclude.m4 (GLIBCXX_CHECK_ASSEMBLER_HWCAP): Restrict test to
	Solaris targets.
	* configure: Regenerate.

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Rainer Orth, Center for Biotechnology, Bielefeld University