updated for version 7.3.859
Problem: 'ambiwidth' must be set by the user.
Solution: Detects East Asian ambiguous width (UAX #11) state of the terminal
at the start-up time and 'ambiwidth' accordingly. (Hayaki Saito)
diff --git a/src/proto/term.pro b/src/proto/term.pro
index 9958763..720d028 100644
--- a/src/proto/term.pro
+++ b/src/proto/term.pro
@@ -34,6 +34,7 @@
void starttermcap __ARGS((void));
void stoptermcap __ARGS((void));
void may_req_termresponse __ARGS((void));
+void may_req_ambiguous_character_width __ARGS((void));
int swapping_screen __ARGS((void));
void setmouse __ARGS((void));
int mouse_has __ARGS((int c));