Modified top level makefile to conditionally set the MAKEFILE variable.

Fixed warning in non-tiles build.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3212 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on January 5, 2008
MWS346AS2OCQYDQ64HRT3U47NJCRGEYBLMT5K7DWSWT7ULMA4WLAC
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