Add support for H265 decoding, including predictive frames

Some features are missing, such as scaling lists (quantization) and
10-bit output.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>

src/Makefile.am

@@ -6,13 +6,13 @@ backend_libs = -lpthread -ldl $(DRM_LIBS) $(LIBVA_DEPS_LIBS)
 
 backend_c = request.c object_heap.c config.c surface.c context.c buffer.c \
 	mpeg2.c picture.c subpicture.c image.c v4l2.c video.c media.c utils.c \
-	h264.c
+	h264.c h265.c
 
 backend_s = tiled_yuv.S
 
 backend_h = request.h object_heap.h config.h surface.h context.h buffer.h \
 	mpeg2.h picture.h subpicture.h image.h v4l2.h video.h media.h utils.h \
-	tiled_yuv.h h264.h
+	tiled_yuv.h h264.h h265.h
 
 v4l2_request_drv_video_la_LTLIBRARIES = v4l2_request_drv_video.la
 v4l2_request_drv_video_ladir = $(LIBVA_DRIVERS_PATH)