patch 9.0.0955: libvterm does not support the XTQMODKEYS request

Problem:    Libvterm does not support the XTQMODKEYS request.
Solution:   Implement the XTQMODKEYS request and response.  Update the keycode
            check results.

src/version.c

@@ -695,6 +695,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    955,
 /**/
     954,
 /**/