Remove mention of DATA_DIR_PATH from AppHdr.h. The recommended way of forcing

a data directory path is to set DATADIR in makefile.unix.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@527 c06c8d41-db1a-0410-9941-cceddc491573

Created by  dshaligram  on November 29, 2006
RDPPCQA4RAZK6ZQEJ2GGKIIMUABGVGJ2AD3BQTBUFCNVFAXKBRWQC
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