Add support for dynamic detection of supported codecs

H.264 and H.265 support is still not supported upstream,
so it makes sense to autodetect each codec and only
enable those that are supported.

Signed-off-by: Ezequiel Garcia <ezequiel@collabora.com>

src/Makefile.am

@@ -5,8 +5,19 @@ backend_ldflags = -module -avoid-version -no-undefined -Wl,--no-undefined
 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 h265.c
+	picture.c subpicture.c image.c v4l2.c video.c media.c utils.c
+
+if WITH_MPEG2
+backend_c += mpeg2.c
+endif
+
+if WITH_H264
+backend_c += h264.c
+endif
+
+if WITH_H265
+backend_c += h265.c
+endif
 
 backend_s = tiled_yuv.S