Fixes build issues when building gstreamer-sharp separately from the monorepo. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6182>
Fixes build issues when building gstreamer-sharp separately from the monorepo. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6182>