patch 7.4.1391

Problem:    Warning for uninitialzed variable.
Solution:   Set it to zero. (Christian Brabandt)

src/version.c

@@ -748,6 +748,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1391,
 /**/
     1390,
 /**/