Ignore more source-position
Ignore more source-position

On my f30 system /usr/share/gir-1.0/GLib-2.0.gir,
<source-position> element is present in more places than initially
added in commit d3777ea685f941376cd49129c102d83b52426cc1.

Related to:
https://github.com/gtk-rs/gir/issues/748

Signed-off-by: Marc-André Lureau <a6f2b960a4aca61381fc650a67901b2ac8e83e6d@redhat.com>

GuillaumeGomez/gir,gtk-rs/gir,gtk-rs/gir,gtk-rs/gir,EPashkin/gir,GuillaumeGomez/gir,GuillaumeGomez/gir,EPashkin/gir