[build] Use -z ignore instead of --as-needed on Solaris

[Rainer Orth]

While the Solaris linker doesn't support the --as-needed/--no-as-needed
options (yet), it long has provided the equivalent -z ignore/-z record
options.  This patch makes use of them, avoiding unnecessary
dependencies on libgcc_s.so.1.

Bootstrapped without regressions on i386-pc-solaris2.11 (and checking
that many dependencies on libgcc_s.so.1 in runtime libraries are gone
that were flagged as unused by ldd -u) and x86_64-unknown-linux-gnu
(gcc/specs unchanged, make check still running).

Ok for mainline if it passes?

Thanks.
        Rainer


2013-04-05  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	* configure.ac (gcc_cv_ld_as_needed): Set
	gcc_cv_ld_as_needed_option, gcc_cv_no_as_needed_option.
	Use -z ignore, -z record on *-*-solaris2*.
	(HAVE_LD_AS_NEEDED): Update comment.
	(LD_AS_NEEDED_OPTION, LD_NO_AS_NEEDED_OPTION): Define.
	* configure: Regenerate.
	* config.in: Regenerate.
	* gcc.c (init_gcc_specs) [USE_LD_AS_NEEDED]: Use
	LD_AS_NEEDED_OPTION, LD_NO_AS_NEEDED_OPTION.
	* config/sol2.h [HAVE_LD_AS_NEEDED] (USE_LD_AS_NEEDED): Define.
	* doc/tm.texi.in (USE_LD_AS_NEEDED): Allow for --as-needed
	equivalents.  Fix markup.
	* doc/tm.texi: Regenerate.

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Rainer Orth, Center for Biotechnology, Bielefeld University