* testsuite/thread/pthread1.cc: Enable on cygwin.
	* 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.

From-SVN: r49214