xserver-xorg: update 1.20.13 -> 21.1.1

xserver-xorg: update 1.20.13 -> 21.1.1

libxcvt is a new dependency (thanks Oleksandr!).

Include ${libdir}/xorg/modules/input/*.so into the main
package (if for someone separate packaging matters, please
investigate what they do).

Remove options no longer present upstream.

Remove patches available upstream; drop a chunk as well.

Signed-off-by: Alexander Kanavin <alex@linutronix.de>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>