maintainer-feedback requested: [Bug 238590] [devel/libpciaccess] Missing open_device_io() method breaks some consumers (e.g., xf86-video-qxl)

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Bug 238590: [devel/libpciaccess] Missing open_device_io() method breaks some
consumers (e.g., xf86-video-qxl)
https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238590



--- Description ---
For QXL in particular, this breaks FreeBSD guests running under common Linux
virt-manager for QEMU/KVM with QXL video.  (QXL is the default paravirtualized
display device there.)	The symptom manifests as Xorg segfaulting at NULL+8 in
pci_io_write8().

Adding the method is trivial; our existing "legacy" open method works
sufficiently to implement the missing one.  See patch:

https://gitlab.freedesktop.org/xorg/lib/libpciaccess/merge_requests/4