* ztest.c: #include <errno.h>.
	(TEST_TIMING): Don't define, don't test.
	(xclock_gettime, xclockid_t): Define if !HAVE_CLOCK_GETTIME.
	(clockid_t, clock_gettime, CLOCK_REALTIME): Likewise.
	(ZLIB_CLOCK_GETTIME_ARG): Define.
	* configure.ac: Change clock_gettime_link to CLOCK_GETTIME_LINK.
	* Makefile.am: Likewise.
	* configure, Makefile.in: Rebuild.

From-SVN: r253377