patch 8.1.1265: when GPM mouse support is enabled double clicks do not work

Problem:    When GPM mouse support is enabled double clicks in xterm do not
            work.
Solution:   Use KS_GPM_MOUSE for GPM mouse events.
diff --git a/src/version.c b/src/version.c
index f2abf24..3edde60 100644
--- a/src/version.c
+++ b/src/version.c
@@ -768,6 +768,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1265,
+/**/
     1264,
 /**/
     1263,