Add missing file from last patch
	* cygerrno.h (seterrno): Define as (always) inline function.
	* errno.cc (seterrno): Remove.
	* cygerrno.h (seterrno): Define as (always) inline function.
	* errno.cc (seterrno): Remove.
	* winsup.h (_GNU_SOURCE): Define.  Explain why.
	* configure.ac: Convert to new AC_INIT style.
	* configure: Regenerate.
	* winsup.h (_GNU_SOURCE): Define.  Explain why.
	* configure.ac: Convert to new AC_INIT style.
	* configure: Regenerate.
	* configure.ac: Convert to new AC_INIT style.
	* configure: Regenerate.