Update libm from upstream.

Bug: N/A
Test: ran tests
Change-Id: Ifa03eb36d412a2776208cd2921936be4724e5547
diff --git a/libm/upstream-freebsd/lib/msun/src/s_logbl.c b/libm/upstream-freebsd/lib/msun/src/s_logbl.c
index 7e88e36..ae71302 100644
--- a/libm/upstream-freebsd/lib/msun/src/s_logbl.c
+++ b/libm/upstream-freebsd/lib/msun/src/s_logbl.c
@@ -10,9 +10,8 @@
  * ====================================================
  */
 
-#ifndef lint
-static char rcsid[] = "$FreeBSD$";
-#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: head/lib/msun/src/s_logbl.c 306409 2016-09-28 14:48:34Z emaste $");
 
 #include <float.h>
 #include <limits.h>