[Bug 217825] multimedia/libva-intel-driver: problem with the driver name

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=217825

            Bug ID: 217825
           Summary: multimedia/libva-intel-driver: problem with the driver
                    name
           Product: Ports & Packages
           Version: Latest
          Hardware: Any
                OS: Any
            Status: New
          Severity: Affects Only Me
          Priority: ---
         Component: Individual Port(s)
          Assignee: madpilot at FreeBSD.org
          Reporter: henry.hu.sh at gmail.com
             Flags: maintainer-feedback?(madpilot at FreeBSD.org)
          Assignee: madpilot at FreeBSD.org

Today, I tried mpv on some mp4 file, and it says
libva info: Trying to open /usr/local/lib/va/i915_drv_video.so
libva info: va_openDriver() returns -1
The same happens for vainfo.

It seems like that only i965_drv_video.so is installed. The reason seems to be
that on Linux, they have i915 and i965 drivers, and only the devices supported
by i965 supports vaapi (some of them).
However, on FreeBSD we only have i915 which supports all the devices.
>From Xorg.0.log we can see
[   405.175] (II) modeset(0): [DRI2] Setup complete
[   405.175] (II) modeset(0): [DRI2]   DRI driver: i915
[   405.175] (II) modeset(0): [DRI2]   VDPAU driver: i915
while old hardware under linux says
[    80.051] (II) intel(0): [DRI2] Setup complete
[    80.051] (II) intel(0): [DRI2]   DRI driver: i965
[    80.051] (II) intel(0): [DRI2]   VDPAU driver: va_gl
and libva seems to be loading drivers based on the dri driver name.

The most simple fix seems to be making a symlink to i915_drv_video.so, which is
also somewhere correct, because we do have i915 driver which supports VAAPI.
Another fix may be changing libva's logic and load i965_drv_video.so instead.

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