[build, v3] Return gthr-posix.h to libgcc (PR bootstrap/50982)

[Rainer Orth]

The gthr move to libgcc broke bootstrap on AIX in libstdc++:
gthr-default.h is gthr-aix.h, which included config/gthr-posix.h.  This
works fine for the original files in libgcc, but the modified copy of
gthr-default.h in libstc++-v3/include/<target>/bits couldn't find
config/gthr-posix.h.  The easiest solution was to return gthr-posix.h to
libgcc, as it had been in my original patch.

Bootstrapped without regressions on i386-pc-solaris2.{8, 11} and
sparc-sun-solaris2.{8, 11} and by David on AIX.

Approved by Paolo in the PR, installed on mainline.

	Rainer


2011-11-03  Rainer Orth  <ro@CeBiTec.Uni-Bielefeld.DE>

	libgcc:
	PR bootstrap/50982
	* config/gthr-posix.h: Move ...
	* gthr-posix.h: ... here.
	* config/gthr-lynx.h: Reflect this.
	* config/gthr-vxworks.h: Likewise.
	* config/rs6000/gthr-aix.h: Likewise.
	* configure.ac (target_thread_file): Likewise.
	* configure: Regenerate.

	libstdc++-v3:
	PR bootstrap/50982
	* include/Makefile.am (${host_builddir}/gthr-posix.h): Reflect
	gthr-posix.h move.
	* include/Makefile.in: Regenerate.

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Rainer Orth, Center for Biotechnology, Bielefeld University