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/
REVIEWBOARD_URL = "https://reviews.imfreedom.org/"
REPOSITORY = "pidgin/pidgin"
REPOSITORY_TYPE = "mercurial"
BRANCH = "default"
LAND_DEST_BRANCH = "default"
LAND_PUSH = False