Limit the number of tries used to find a random space on the level in

monster_random_space(), as is done with random_near_space().

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7631 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dolorous  on November 25, 2008
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