talkatu/talkatu

Add the gir target to the library dependency object and other meson cleanups.

Testing Done:
Compiled

Reviewed at https://reviews.imfreedom.org/r/941/
[main]
host = https://www.transifex.com
[talkatu.talkatu-pot]
file_filter = po/<lang>.po
minimum_perc = 0
source_file = po/talkatu.pot
source_lang = en
type = PO