Force a screen re-draw after tcap 'ti' on terminal open

The 'tcapkopen()' function re-initializes the terminal with the 'ti'
sequence, which for most sane termcap entries is just empty.  But for
'xterm', that seems to actually be a real control sequence (clear and
reset?), and we'd better tell display.c that the screen is now garbage
and needs to be re-drawn.

Also, make tcapkclose() match the 'ti' (terminal init) with a 'te'
(terminal exit).

Maybe we should just stop playing games with ti/te, but this at least
improves the situation a bit.

Reported-by: Bijan Soleymani <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

tcap.c

@@ -229,12 +229,19 @@ static void tcapkopen(void)
 #if	PKCODE
 	putpad(TI);
 	ttflush();
+	ttrow = 999;
+	ttcol = 999;
+	sgarbf = TRUE;
 #endif
 	strcpy(sres, "NORMAL");
 }
 
 static void tcapkclose(void)
 {
+#if	PKCODE
+	putpad(TE);
+	ttflush();
+#endif
 }
 
 static void tcapmove(int row, int col)