Update libm from upstream.

Bug: N/A
Test: ran tests
Change-Id: Ifa03eb36d412a2776208cd2921936be4724e5547
diff --git a/libm/upstream-freebsd/lib/msun/src/s_fmin.c b/libm/upstream-freebsd/lib/msun/src/s_fmin.c
index 3500c84..d49bedb 100644
--- a/libm/upstream-freebsd/lib/msun/src/s_fmin.c
+++ b/libm/upstream-freebsd/lib/msun/src/s_fmin.c
@@ -1,4 +1,6 @@
 /*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
  * Copyright (c) 2004 David Schultz <das@FreeBSD.ORG>
  * All rights reserved.
  *
@@ -25,8 +27,9 @@
  */
 
 #include <sys/cdefs.h>
-__FBSDID("$FreeBSD$");
+__FBSDID("$FreeBSD: head/lib/msun/src/s_fmin.c 326219 2017-11-26 02:00:33Z pfg $");
 
+#include <float.h>
 #include <math.h>
 
 #include "fpmath.h"
@@ -51,3 +54,7 @@
 
 	return (x < y ? x : y);
 }
+
+#if (LDBL_MANT_DIG == 53)
+__weak_reference(fmin, fminl);
+#endif