patch 8.1.0563: setting v:errors to a string give confusing error

Problem:    Setting v:errors to a string give confusing error. (Christian
            Brabandt)
Solution:   Change internal error into normal error message.

src/version.c

@@ -792,6 +792,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    563,
 /**/
     562,
 /**/