patch 8.1.2181: highlighting wrong when item follows tab

Problem:    Highlighting wrong when item follows tab.
Solution:   Don't use syntax attribute when n_extra is non-zero.
            (Christian Brabandt, closes #5076)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2181,
 /**/
     2180,
 /**/