patch 8.1.1316: duplicated localtime() call

Problem:    Duplicated localtime() call.
Solution:   Delete one.

src/undo.c

@@ -3117,7 +3117,6 @@ u_add_time(char_u *buf, size_t buflen, time_t tt)
 
     if (vim_time() - tt >= 100)
     {
-	curtime = localtime(&tt);
 # ifdef HAVE_LOCALTIME_R
 	curtime = localtime_r(&tt, &tmval);
 # else

src/version.c

@@ -767,6 +767,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1316,
 /**/
     1315,
 /**/