Patch attached.  The new version of Crawl is amazing.  Completely
reworked spell system and everything!

However, apparently the -nodeps.tar.xz release is normally made before
the Debian release... since I expressed interest in packaging 0.25.0
asap one of the devs made the tarball themselves, but apparently from an
OSX machine, and it left all these ._* doodads in it, which broke
compilation.  I added a couple of lines to get rid of them.

I'm not sure if they're going to release another tarball that removes
those; I guess if they do, that'll have a different hash.  In the
meanwhile this does work.

I'm not sure if I should push it or not given the above.  Maybe we
should wait to see if the dev responds to me on IRC about the ._* files.
(Apparently after the tournament is done, a 0.25.1 release is likely
soon anyway.)

 - Chris