ffmpeg 4.2: Disable dav1d again.

It can only be built against the old version.

media-video/ffmpeg/ffmpeg-4.2.2.recipe

@@ -6,7 +6,7 @@ HOMEPAGE="https://ffmpeg.org/"
 COPYRIGHT="2000-2003 Fabrice Bellard
 	2003-2019 the FFmpeg developers"
 LICENSE="GNU LGPL v3"
-REVISION="9"
+REVISION="10"
 SOURCE_URI="https://ffmpeg.org/releases/ffmpeg-$portVersion.tar.xz"
 CHECKSUM_SHA256="cb754255ab0ee2ea5f66f8850e1bd6ad5cac1cd855d0a2f4990fb8c668b0d29c"
 PATCHES="ffmpeg-$portVersion.patchset"
@@ -68,7 +68,7 @@ if [ "$effectiveTargetArchitecture" != x86_gcc2 ]; then
 #		lib:libbs2b$secondaryArchSuffix
 #		lib:libcaca$secondaryArchSuffix
 #		lib:libcairo$secondaryArchSuffix
-		lib:libdav1d$secondaryArchSuffix
+#		lib:libdav1d$secondaryArchSuffix
 		lib:libfdk_aac$secondaryArchSuffix
 		lib:libfontconfig$secondaryArchSuffix
 		lib:libfreetype$secondaryArchSuffix
@@ -191,7 +191,7 @@ if [ "$effectiveTargetArchitecture" != x86_gcc2 ]; then
 #		devel:libbs2b$secondaryArchSuffix
 #		devel:libcaca$secondaryArchSuffix
 #		devel:libcairo$secondaryArchSuffix
-		devel:libdav1d$secondaryArchSuffix
+#		devel:libdav1d$secondaryArchSuffix
 		devel:libfdk_aac$secondaryArchSuffix
 		devel:libfontconfig$secondaryArchSuffix
 		devel:libfreetype$secondaryArchSuffix
@@ -286,7 +286,6 @@ BUILD()
 		export LDFLAGS="$baseLDFLAGS $(pwd)/gcc_runtime.o"
 	else
 		extraArgs="--enable-libass \
-			--enable-libdav1d \
 			--enable-libfdk-aac \
 			--enable-fontconfig \
 			--enable-libfreetype \