This should make "meson devenv" closer to what "gst-env.py" sets. - GST_VALIDATE_SCENARIOS_PATH - GST_VALIDATE_APPS_DIR - GST_OMX_CONFIG_DIR - GST_ENCODING_TARGET_PATH - GST_PRESET_PATH - GST_PLUGIN_SCANNER - GST_PTP_HELPER - _GI_OVERRIDES_PATH Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/1768>