Bug fixes from Scott Schwartz.

Try to make 9term not crash when X errors happen.

src/libdraw/x11-init.c

@@ -127,6 +127,9 @@ xerror(XDisplay *d, XErrorEvent *e)
 
 	if(e->request_code == 42) /* XSetInputFocus */
 		return 0;
+	if(e->request_code == 18) /* XChangeProperty */
+		return 0;
+
 	print("X error: error_code=%d, request_code=%d, minor=%d disp=%p\n",
 		e->error_code, e->request_code, e->minor_code, d);
 	XGetErrorText(d, e->error_code, buf, sizeof buf);