patch 8.2.0756: MS-Windows: still a compiler warning

Problem:    MS-Windows: still a compiler warning.
Solution:   Move flag to another place in the Makefile. (Ken Takata,
            closes #6083)
diff --git a/src/version.c b/src/version.c
index 1f77ddc..44f816a 100644
--- a/src/version.c
+++ b/src/version.c
@@ -747,6 +747,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    756,
+/**/
     755,
 /**/
     754,