updated for version 7.3.457

Problem:    When setting $VIMRUNTIME later the directory for fetching
            translated messages is not adjusted.
Solution:   Put bindtextdomain() in vim_setenv().

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    457,
 /**/
     456,
 /**/