Fix 1936711: Portals not disappearing properly.

These portals to bazaars now leave an empty stone arch behind, just like I've always envisioned it. :) (Labyrinths still disappear completely.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@4184 c06c8d41-db1a-0410-9941-cceddc491573

Created by  j-p-e-g  on April 10, 2008
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