pidgin/pidgin

Fix up the dependencies for our gir files and ensure ours will work as a subproject

Testing Done:
Tested against gplugin 0.34.1 and everything is working well.

Reviewed at https://reviews.imfreedom.org/r/942/
i18n = import('i18n')
i18n.gettext('pidgin',
args : '--from-code=utf-8',
install : get_option('nls'),
)