Add fud for CLOCK_MONOTONIC_RAW, even though (FWIW) it doesn't work on
my system, which is bizarre, but I'm spying a delightful inconsistency
with this constant in the glibc headers and how the value is exported.

Signed-off-by: Garrett Cooper <yanegomi@gmail.com>
diff --git a/m4/ltp-time.m4 b/m4/ltp-time.m4
index b7461c0..3ff9e62 100644
--- a/m4/ltp-time.m4
+++ b/m4/ltp-time.m4
@@ -26,7 +26,10 @@
 dnl ----------------------------
 dnl
 AC_DEFUN([LTP_CHECK_TIME],[
-	AC_CHECK_DECLS([CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE],,,[
+	AC_CHECK_DECLS([CLOCK_MONOTONIC_RAW, CLOCK_REALTIME_COARSE, CLOCK_MONOTONIC_COARSE],,,[
+#ifndef _GNU_SOURCE
+#define _GNU_SOURCE
+#endif
 #include <time.h>
 ])
 ])