patch 9.0.0763: MS-Windows: warning for using int for size_t

Problem:    MS-Windows: warning for using int for size_t.
Solution:   Declare variable as size_t.

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    763,
 /**/
     762,
 /**/