updated for version 7.3.421

Problem:    Get E832 when setting 'undofile' in vimrc and there is a file to
            be edited on the command line. (Toothpik)
Solution:   Do not try reading the undo file for a file that wasn't loaded.

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    421,
 /**/
     420,
 /**/