updated for version 7.3.312

Problem:    Can't compile with tiny features.
Solution:   Add #ifdef around win_valid().

src/version.c

@@ -709,6 +709,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    312,
 /**/
     311,
 /**/