Add the conceal patch from Vince Negri.
diff --git a/src/proto/move.pro b/src/proto/move.pro
index de51aa2..f1f3a11 100644
--- a/src/proto/move.pro
+++ b/src/proto/move.pro
@@ -1,4 +1,5 @@
 /* move.c */
+void do_check_cursorbind __ARGS((void));
 void update_topline_redraw __ARGS((void));
 void update_topline __ARGS((void));
 void update_curswant __ARGS((void));