patch 8.1.0122: translators don't always understand the maintainer message

Problem:    Translators don't always understand the maintainer message.
Solution:   Add a comment that ends up in the generated po file. (Christian
            Brabandt, closes #3037)

src/version.c

@@ -789,6 +789,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    122,
 /**/
     121,
 /**/