libva-driver-intel: Add patch by btbn to track and workaround empty surfaces

packages/multimedia/libva-driver-intel/patches.upstream/libva-driver-intel-fix-surface_empty.patch

@@ -0,0 +1,16 @@
+diff --git a/src/i965_drv_video.c b/src/i965_drv_video.c
+index 31dafa2..a58eb7b 100755
+--- a/src/i965_drv_video.c
++++ b/src/i965_drv_video.c
+@@ -2358,7 +2358,11 @@ i965_QuerySurfaceStatus(VADriverContextP ctx,
+             *status = VASurfaceReady;
+         }
+     } else {
++#ifdef HAVE_VA_SURFACE_STATUS_EMPTY
++        *status = VASurfaceReady | VASurfaceEmpty;
++#else
+         *status = VASurfaceReady;
++#endif
+     }
+ 
+     return VA_STATUS_SUCCESS;