[xmonad] Dead contribs: a little reminder

[Devin Mullins]

Ahoy,

Just a reminder that HintedTile, Magnifier, Mosaic, and Anneal have been
disabled, because they've bitrotted. (Well, Anneal just because its
only user is Mosaic.) I'm pretty sure they should just be deleted by 0.5,
so if you want to fight for their preseveration, patch away. (Or if you
think they should be left in in non-compiling form, well, argue that,
you loser.)

Devin