patch 7.4.772

Problem:    Racket 6.2 is not supported on MS-Windows.
Solution:   Check for the "racket" subdirectory. (Weiyong Mao)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    772,
 /**/
     771,
 /**/