patch 9.1.1485: missing Wayland clipboard support

Problem:  missing Wayland clipboard support
Solution: make it work (Foxe Chen)

fixes: #5157
closes: #17097

Signed-off-by: Foxe Chen <chen.foxe@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/evalvars.c b/src/evalvars.c
index 9382842..d94d3e8 100644
--- a/src/evalvars.c
+++ b/src/evalvars.c
@@ -163,6 +163,8 @@
     {VV_NAME("t_enumvalue",	 VAR_NUMBER), NULL, VV_RO},
     {VV_NAME("stacktrace",	 VAR_LIST), &t_list_dict_any, VV_RO},
     {VV_NAME("t_tuple",		 VAR_NUMBER), NULL, VV_RO},
+    {VV_NAME("wayland_display",  VAR_STRING), NULL, VV_RO},
+    {VV_NAME("clipmethod",  VAR_STRING), NULL, VV_RO},
 };
 
 // shorthand