patch 7.4.1981

Problem:    No testing for Farsi code.
Solution:   Add a minimal test.  Clean up Farsi code.

src/version.c

@@ -758,6 +758,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1981,
 /**/
     1980,
 /**/