patch 7.4.999

Problem:    "make shadow" creates a broken link. (Tony Mechelynck)
Solution:   Remove vimrc.unix from the list.

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    999,
 /**/
     998,
 /**/