patch 9.0.0660: mapping with CTRL keys does not work in the GUI

Problem:    Mapping with CTRL keys does not work in the GUI.
Solution:   Recognize CSI next to K_SPECIAL. (closes #11275, closes #11270)
diff --git a/src/version.c b/src/version.c
index ce0dce0..3adb513 100644
--- a/src/version.c
+++ b/src/version.c
@@ -700,6 +700,8 @@
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    660,
+/**/
     659,
 /**/
     658,