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build: prepend to LD_LIBRARY_PATH and GI_TYPELIB_PATH

Alyssa Ross requested to merge qyliss/ModemManager:GI_TYPELIB_PATH into main

In Nixpkgs packages are installed in separate prefixes. Starting from GLib / gobject-introspection 2.80, GLib introspection data is provided by GLib itself instead of gobject-introspection. This causes tests failures in Nixpkgs because the GI_TYPELIB_PATH set by the build environment was overridden, leaving it unable to find GLib:

    ImportError: cannot import name GLib, introspection typelib not found

Only GI_TYPELIB_PATH needs to be preserved in our case, but I've made the same change for LD_LIBRARY_PATH, other environments might rely on that in a similar way.

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