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/proto/clipboard.pro b/src/proto/clipboard.pro
index f3e8cab..e21f1e2 100644
--- a/src/proto/clipboard.pro
+++ b/src/proto/clipboard.pro
@@ -35,4 +35,10 @@
 int may_get_selection(int regname);
 void may_set_selection(void);
 void adjust_clip_reg(int *rp);
+void clip_wl_request_selection(Clipboard_T *cbd);
+int clip_wl_own_selection(Clipboard_T *cbd);
+void clip_wl_lose_selection(Clipboard_T *cbd);
+void clip_wl_set_selection(Clipboard_T *cbd);
+char *choose_clipmethod(void);
+void ex_clipreset(exarg_T *eap);
 /* vim: set ft=c : */