updated for version 7.4.504

Problem:    Restriction of the MS-Windows installer that the path must end in
            "Vim" prevents installing more than one version.
Solution:   Remove the restriction. (Tim Lebedkov)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    504,
 /**/
     503,
 /**/