updated for version 7.4.647

Problem:    After running the tests on MS-Windows many files differ from their
            originals as they were checked out.
Solution:   Use a temp directory for executing the tests. (Ken Takata, Taro
            Muraoka)

src/version.c

@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    647,
 /**/
     646,
 /**/