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

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238590

            Bug ID: 238590
           Summary: [devel/libpciaccess] Missing open_device_io() method
                    breaks some consumers (e.g., xf86-video-qxl)
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: x11 at FreeBSD.org
          Reporter: cem at freebsd.org
             Flags: maintainer-feedback?(x11 at FreeBSD.org)
          Assignee: x11 at FreeBSD.org

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

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