Make sure that flatpak gst-python overrides are always used first.
@thiblahute
Submitted by Thibault Saunier Assigned to Thibault Saunier @thiblahute
Description
We used to only add the overrides from the used prefix, but that fails with
ninja -C dist
as it doesn't use any prefix, so make sure to use gst-python
from flatpak if available.