Update libm from upstream.

Bug: N/A
Test: ran tests
Change-Id: Ifa03eb36d412a2776208cd2921936be4724e5547
diff --git a/libm/upstream-freebsd/lib/msun/src/e_fmod.c b/libm/upstream-freebsd/lib/msun/src/e_fmod.c
index 720aa03..bad066a 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_fmod.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_fmod.c
@@ -12,7 +12,7 @@
  */
 
 #include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
+__FBSDID("$FreeBSD: head/lib/msun/src/e_fmod.c 305380 2016-09-04 12:01:32Z bde $");
 
 /* 
  * __ieee754_fmod(x,y)
@@ -20,6 +20,8 @@
  * Method: shift and subtract
  */
 
+#include <float.h>
+
 #include "math.h"
 #include "math_private.h"
 
@@ -130,3 +132,7 @@
 	}
 	return x;		/* exact output */
 }
+
+#if (LDBL_MANT_DIG == 53)
+__weak_reference(fmod, fmodl);
+#endif