When doing "make depend" only clobber the current makefile.dep after the new

one is complete, instead of deleting it before making the new one.

git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@7877 c06c8d41-db1a-0410-9941-cceddc491573

Created by  zelgadis  on December 19, 2008
QJSVN6CHOX7HBKPADNK4DJEN2FLGT7IFT7EWUWGFCHU65O5JKQRQC
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