[1968164] Fixing issue where monster can be generated inside of a rock wall. The special rooms don't check for DNGN_BUILDER_SPECIAL_WALL when placing monsters and so they may get placed on spots that will turn into walls later.

I could have fixed this by adjusting the dungeon_feature_type enumeration to place special walls earlier, but I'm a little scared of mucking with it.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@5371 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on May 31, 2008
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