Sync upstream FreeBSD libm.

Test: treehugger
Change-Id: I583a3e93821d512c975db34fc1610ffd22445d58
diff --git a/libm/upstream-freebsd/lib/msun/src/e_gamma.c b/libm/upstream-freebsd/lib/msun/src/e_gamma.c
index 28fb5cc..a13f3e2 100644
--- a/libm/upstream-freebsd/lib/msun/src/e_gamma.c
+++ b/libm/upstream-freebsd/lib/msun/src/e_gamma.c
@@ -15,10 +15,10 @@
 #include <sys/cdefs.h>
 __FBSDID("$FreeBSD$");
 
-/* __ieee754_gamma(x)
+/* gamma(x)
  * Return the logarithm of the Gamma function of x.
  *
- * Method: call __ieee754_gamma_r
+ * Method: call gamma_r
  */
 
 #include "math.h"
@@ -27,7 +27,7 @@
 extern int signgam;
 
 double
-__ieee754_gamma(double x)
+gamma(double x)
 {
-	return __ieee754_gamma_r(x,&signgam);
+	return gamma_r(x,&signgam);
 }