gstreamer1.0-omx: remove the .bbappend

oe-core upgrade 1.22.11 -> 1.24.3:
openembedded/openembedded-core@9c21815

be aware that this also dropped gstreamer1.0-omx recipe as upstream has removed it:
https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4976
and similarly for libomxil:
openembedded/openembedded-core@63535ce

So now meta-raspberrypi doesn't parse again due to this .bbappend

Remove it to unblock parsing, but there will be other improvements
or cleanups needed later (preferrably by someone who was using that
I'm just seeing parsing failure in world builds). e.g.:

conf/machine/include/rpi-default-providers.inc:PREFERRED_PROVIDER_virtual/libomxil ?= "userland"
conf/machine/include/rpi-default-providers.inc:VIRTUAL-RUNTIME_libomxil = "userland"
dynamic-layers/multimedia-layer/recipes-multimedia/rpidistro-vlc/rpidistro-vlc_3.0.17.bb:    file://3003-codec-omxil_core-replace-opt-vc-path-with-usr-lib.patch \
dynamic-layers/multimedia-layer/recipes-multimedia/rpidistro-vlc/rpidistro-vlc_3.0.17.bb:    file://3006-codec-omxil_core.h-fix-multiple-definition-of.patch \
dynamic-layers/multimedia-layer/recipes-multimedia/rpidistro-vlc/rpidistro-vlc_3.0.17.bb:PACKAGECONFIG[mmal] = "--enable-omxil --enable-omxil-vout --enable-rpi-omxil --enable-mmal --enable-mmal-avcodec,,userland"
recipes-graphics/userland/userland_git.bb:PROVIDES += "virtual/libomxil"
recipes-multimedia/omxplayer/omxplayer_git.bb:DEPENDS = "alsa-lib libpcre virtual/egl boost freetype dbus openssl libssh virtual/libomxil coreutils-native curl-native userland"

Signed-off-by: Martin Jansa <[email protected]>