Fix for previous check-in of makefile_tiles.mgw to not try to copy files that don't exist.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3500 c06c8d41-db1a-0410-9941-cceddc491573

Created by  ennewalker  on March 1, 2008
5ZURTQ7ICPHRLLQ36KJJUQIK6ZEJXVQHL6JB7T453UAPGXFMHY4QC
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