PR libgomp/26175

	PR libgomp/26477
	* configure.ac: If neither --enable-linux-futex nor
	--disable-linux-futex is passed, determine the default by checking
	for compiling and/or running against NPTL.  With --enable-linux-futex,
	check if SYS_gettid and SYS_futex are defined.
	* configure: Rebuilt.


git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@114809 138bc75d-0d04-0410-961f-82ee72b054a4