* gcc.c (SANITIZER_SPEC): Don't error on -fsanitize=thread
	without -pie or -shared, error on -fsanitize=thread -static instead.

	* lib/tsan-dg.exp (check_effective_target_fsanitize_thread,
	tsan_init): Don't use -fPIE or -pie.

From-SVN: r218097