main/xen: fix xen-qemu package
- Xen looks for /usr/share/qemu-xen/qemu but xen-qemu installed to /usr/share/qemu, and would also collide the community/qemu aport
- use amove
- keep the default libexecdir
- install desktop entry as /usr/share/applications/qemu-xen.desktop
- build pv-grub stubdoms and qemu-traditional based device model, disabled by default since 4.16
Related !14877 (closed) !28169 (closed)
Edited by omni