differently under Windows and Unix-line systems.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3063 c06c8d41-db1a-0410-9941-cceddc491573
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MWSVBTAGR4TOFWUFGBMCEJDJZ76FGZ3LYEPDRO4OPOTBT3BDDQRAC
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rgetch = c_getch;
rgetch = m_getch;