check and restrict size hint values

Could not reproduce a crash, but may mess up window geometry, etc.

Test program below to give an idea:

cc repro.c -o repro -lX11; ./repro

int
main(void)
{
	Display *d;
	int screen;
	Window root;
	Window win;

	d = XOpenDisplay(NULL);
	if (!d) {
		fprintf(stderr, "XOpenDisplay failed\n");
		return 1;
	}
	screen = DefaultScreen(d);
	root = RootWindow(d, screen);

	win = XCreateSimpleWindow(d, root, 0, 0, 100, 100, 0, 0, 0);
	if (!win) {
		fprintf(stderr, "XCreateSimpleWindow failed\n");
		XCloseDisplay(d);
		return 1;
	}

	//XMapWindow(d, win);
	XMapRaised(d, win);

	XSizeHints h = {0};
	h.flags = PResizeInc | PBaseSize | PMinSize;
	h.width_inc = -1;
	h.height_inc = -1;
	h.base_width = INT_MIN + 500; /* window is 500px wide */
	h.base_height = 0;

	h.min_width = ~0L;
	h.min_height = ~0L;

	XSetWMNormalHints(d, win, &h);

	sleep(3);

	//XDestroyWindow(d, win);

	XCloseDisplay(d);

	return 0;
}

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