Changing rltiles to store name -> idx lookup in a straight array, rather than a std::map. (This should hopefully fix Johanna's compile troubles.)

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7771 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on December 7, 2008
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