pidgin/purple-plugin-pack

Somehow I missed checking this in. This makes switchspell build by telling the
plugin_pack.py script we have enchant when doing a Windows build.
[Last Seen]
type=default
depends=pidgin
provides=lastseen
summary=Record when a buddy was last seen
description=Logs the time of a last received message, what they said, when they logged in, and when they logged out, for buddies on your buddy list.
authors=Stu Tomlinson
introduced=1.0beta1
notes=Partially superseded by functionality added in Pidgin 2.1.0.