heads up: patch needed for intel-vaapi-driver to work now.

[pablo-888]

sway/wlroots dropped wl_drm a while ago so sway had to add a flag to re-enable it until things like mesa and libva supported it. Mesa (the non-amber version aka mesa 24) and libva support it now but I think that's only for the intel-media-driver and not the older intel-vaapi-driver. After I installed libva-git from the AUR (arch is still on 2.21) and I manually cloned/installed intel-vaapi-driver/applied this lonely PR intel/intel-vaapi-driver@4206d0e vaapi works again.

before PR:

~ > vainfo 
Trying display: wayland
error: failed to resolve wl_drm_interface(): /usr/lib/libEGL_mesa.so.0: undefined symbol: wl_drm_interface
libva error: /usr/lib/dri/i965_drv_video.so init failed
vaInitialize failed with error code -1 (unknown libva error),exit

after PR:

~ > vainfo 
Trying display: wayland
error: failed to resolve wl_drm_interface(): /usr/lib/libEGL_mesa.so.0: undefined symbol: wl_drm_interface
vainfo: VA-API version: 1.23 (libva 2.22.0)
vainfo: Driver version: Intel i965 driver for Intel(R) Ivybridge Desktop - 2.4.0.pre1 (2.3.0-37-g06c9a89)
vainfo: Supported profile and entrypoints
      VAProfileMPEG2Simple            :	VAEntrypointVLD
      VAProfileMPEG2Simple            :	VAEntrypointEncSlice
      VAProfileMPEG2Main              :	VAEntrypointVLD
      VAProfileMPEG2Main              :	VAEntrypointEncSlice
      VAProfileH264ConstrainedBaseline:	VAEntrypointVLD
      VAProfileH264ConstrainedBaseline:	VAEntrypointEncSlice
      VAProfileH264Main               :	VAEntrypointVLD
      VAProfileH264Main               :	VAEntrypointEncSlice
      VAProfileH264High               :	VAEntrypointVLD
      VAProfileH264High               :	VAEntrypointEncSlice
      VAProfileH264StereoHigh         :	VAEntrypointVLD
      VAProfileVC1Simple              :	VAEntrypointVLD
      VAProfileVC1Main                :	VAEntrypointVLD
      VAProfileVC1Advanced            :	VAEntrypointVLD
      VAProfileNone                   :	VAEntrypointVideoProc
      VAProfileJPEGBaseline           :	VAEntrypointVLD

not sure what "error: failed to resolve wl_drm_interface(): /usr/lib/libEGL_mesa.so.0: undefined symbol: wl_drm_interface" means in this case but hey it works.