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.
diff --git a/src/version.c b/src/version.c
index 08851f8..502655c 100644
--- a/src/version.c
+++ b/src/version.c
@@ -696,6 +696,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    763,
+/**/
     762,
 /**/
     761,