package/ffmpeg: add optional dependency to dav1d

Signed-off-by: Bernd Kuhls <bernd.kuhls@t-online.de>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>

package/ffmpeg/ffmpeg.mk

@@ -403,6 +403,13 @@ else
 FFMPEG_CONF_OPTS += --disable-libx265
 endif
 
+ifeq ($(BR2_PACKAGE_DAV1D),y)
+FFMPEG_CONF_OPTS += --enable-libdav1d
+FFMPEG_DEPENDENCIES += dav1d
+else
+FFMPEG_CONF_OPTS += --disable-libdav1d
+endif
+
 ifeq ($(BR2_X86_CPU_HAS_MMX),y)
 FFMPEG_CONF_OPTS += --enable-x86asm
 FFMPEG_DEPENDENCIES += host-nasm