Automatically resize the screen when the VM window is resized.

Useful for X11 desktop like Xfce, and for Virtualbox and VMware that used to
rely on xf86-video-firmware [1] for that, however this no longer works with
mesa > 25.1 [2] [3] [4]. xautoresize is a workaround.

[1] https://gitlab.freedesktop.org/xorg/driver/xf86-video-vmware/
[2] https://gitlab.freedesktop.org/xorg/driver/xf86-video-vmware/-/issues/12
[3] https://bugs.debian.org/1112670
[4] https://gitlab.archlinux.org/archlinux/packaging/packages/xf86-video-vmware/-/issues/3
