updated for version 7.3.712

Problem:    Nmake from VS2010 SP1 is not recognized.
Solution:   Add the version number. (Ken Takata)

src/version.c

@@ -725,6 +725,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    712,
 /**/
     711,
 /**/