* Fix infinite Xom teleportation rides. Whoops!

  • Move unseen altar/entrance tiles to dngn.png, so they're handled correctly with magic mapping.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@10482 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on August 3, 2009
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