patch 8.0.1211: cannot reorder tab pages with drag & drop

Problem:    Cannot reorder tab pages with drag & drop.
Solution:   Support drag & drop for GTK and MS-Windows. (Ken Takata, Masamichi
            Abe)
diff --git a/src/version.c b/src/version.c
index 6ab48f1..f913633 100644
--- a/src/version.c
+++ b/src/version.c
@@ -762,6 +762,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1211,
+/**/
     1210,
 /**/
     1209,