Removing pidgin-facebookchat package (replaced by purple-facebookchat)

[Bill Nottingham]

Matěj Cepl (mcepl at redhat.com) said: 
> I have bumped the release of my purple-facebookchat with proper Provides
> and Obsoletes, and commited dead.package as described on
> http://fedoraproject.org/wiki/PackageMaintainers/PackageEndOfLife to all
> branches (F-8, F-9, devel).
> 
> Now, I should ask you to block the package from the appropriate
> collections in which it is retired, which I am doing just now.

Blocked from dist-f10. Blocking from updates doesn't really help, as
it's still in the base repo.

Bill