* testsuite/thread/pthread1.cc: Do not invoke pthread_setconcurrency
	on Solaris 2.6 and below.
	* testsuite/thread/pthread2.cc: Likewise.
	* testsuite/thread/pthread3.cc: Likewise.
	* testsuite/thread/pthread4.cc: Likewise.
	* testsuite/thread/pthread5.cc: Likewise.
	* testsuite/thread/pthread6.cc: Likewise.
	* testsuite/thread/pthread7-rope.cc: Likewise.

From-SVN: r95220