multimedia/libva: backport iHD fix for X11

$ pkg install libva-utils libva-intel-media-driver
$ vainfo
libva info: VA-API version 1.7.0
libva info: Trying to open /usr/local/lib/dri/i965_drv_video.so
libva info: va_openDriver() returns -1
vaInitialize failed with error code -1 (unknown libva error),exit

MFH: 2020Q2