patch 7.4.1793

Problem:    Some character classes may differ between systems.  On OS/X the
            regexp test fails.
Solution:   Make this less dependent on the system. (idea by Kazunobu Kuriyama)

src/version.c

@@ -753,6 +753,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1793,
 /**/
     1792,
 /**/