gthr-solaris.h: Remove.

gthr-solaris.h: Remove.

	gcc:
	* gthr-solaris.h: Remove.
	* gthr.h (_SOLARIS_THREADS): Don't include gthr-solaris.h, remove.
	* config/sol2.h (CPP_SUBTARGET_SPEC): Remove -threads support.
	(LIB_SPEC): Likewise.
	* config/sol2.opt (threads): Remove.
	* config.gcc (i[34567]86-*-solaris2*): Remove solaris threads
	support.
	(sparc*-*-solaris2*): Likewise.
	* configure.ac (enable_threads): Enable solaris support.
	* configure: Regenerate.
	* doc/invoke.texi (Option Summary, Solaris 2 Options): Remove
	-threads.
	* doc/install.texi (Configuration, --enable-threads=lib): Remove
	solaris.

	boehm-gc:
	* configure.ac (THREADS): Remove solaris.
	* configure: Regenerate.

	libjava:
	* configure.ac (THREADS): Remove solaris.
	* configure: Regenerate.

From-SVN: r171229