Sync libm with upstream FreeBSD.

Upstream SHA 78599c32efed3247d165302a1fbe8d9203e38974.

Test: treehugger
Change-Id: Ib103d211315e320df89a6f0bcb30cd8ba67dd603
diff --git a/libm/upstream-freebsd/lib/msun/src/s_modfl.c b/libm/upstream-freebsd/lib/msun/src/s_modfl.c
index 2f884d2..2d83bbe 100644
--- a/libm/upstream-freebsd/lib/msun/src/s_modfl.c
+++ b/libm/upstream-freebsd/lib/msun/src/s_modfl.c
@@ -35,7 +35,7 @@
  * is preserved.
  * ====================================================
  *
- * $FreeBSD: head/lib/msun/src/s_modfl.c 326219 2017-11-26 02:00:33Z pfg $
+ * $FreeBSD$
  */
 
 #include <float.h>