patch 7.4.991

Problem:    When running new style tests the output is not visible.
Solution:   Add the testdir/messages file and show it.  Update the list of
            test names.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    991,
 /**/
     990,
 /**/