gnss-share is a location provider I wrote for the librem 5's GPS module,
and can be used directly from geoclue. It allows saving and loading
A-GPS data (manual steps, for now) to facilitate faster fixes.

I'm not completely happy with having to use sed to patch geoclue's conf,
but:

1) I really only need to change 1 line

2) there's a non-zero chance geoclue's conf will be changed in aports if
   new permissions are required for things later

So carrying the config in the device package and using
"replaces=geoclue" (like the postmarketos-* stuff) didn't seem like a
maintainable solution long term since the geoclue conf might gain needed
fixes/features that might make a copy in the device package outdated...