Appease gcc. Init "terminator".

It is plainly obvious that the init value cannot be used (the
var was never used uninit'd - could not be) but gcc apparently cannot
work that out.   Revert this if we ever get a compiler with a brain.

external/bsd/tmux/dist/tty-keys.c

@@ -931,6 +931,7 @@ tty_keys_clipboard(__unused struct tty *tty, const char *buf, size_t len,
 		return (1);
 
 	/* Find the terminator if any. */
+	terminator = 0;	/* XXX: appease gcc (this value is never used) */
 	for (end = 5; end < len; end++) {
 		if (buf[end] == '\007') {
 			terminator = 1;