patch 8.2.1231: MS-Windows: GUI code can be cleaned up

Problem:    MS-Windows: GUI code can be cleaned up.
Solution:   Do a bit of cleaning up. (Ken Takata, closes #6465)
diff --git a/src/version.c b/src/version.c
index 7ee4294..68c1e82 100644
--- a/src/version.c
+++ b/src/version.c
@@ -755,6 +755,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1231,
+/**/
     1230,
 /**/
     1229,