Removing backslashes from makefile and using subst instead. I'm hoping this will solve Johanna's makefile woes that I can't reproduce.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3417 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on February 9, 2008
BGPUXHZ2FDUKA6LAFNBDQJOT3XQGTZQDYBPU7Z6H5HTXZK2EG2BAC
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