updated for version 7.3.556

Problem:    Compiler warnings on 64 bit Windows.
Solution:   Add type casts. (Mike Williams)

src/version.c

@@ -714,6 +714,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    556,
 /**/
     555,
 /**/