pidgin/pidgin

Use the G_DECLARE_*_TYPE macros for JabberProtocol and XMPPProtocol

Testing Done:
Connected an XMPP account.

Reviewed at https://reviews.imfreedom.org/r/618/
i18n = import('i18n')
i18n.gettext('pidgin',
args : '--from-code=utf-8',
install : get_option('nls'),
)