Add LGI for libpeas, required for Lua plugin support
@gregier
Submitted by Garrett Regier Link to original bug (#742553)
Description
GJS plugin support was removed, https://git.gnome.org/browse/libpeas/commit/?id=730edb65d6da0ebd0bd7065aeb9435b31d304b08
Seed plugin support was removed, https://git.gnome.org/browse/libpeas/commit/?id=41331aa6c52dbc29af727a6d0db9a43fcdc03c57
Lua plugin support was added, https://git.gnome.org/browse/libpeas/commit/?id=84a159374c7032f0bc536321df66d4ffac97d9fe
For Lua plugins LGI from git master is required, https://github.com/pavouk/lgi