provided by c_getch() makes Ctrl-H act as expected on Unix-like terminals where Ctrl-H returns KEY_BACKSPACE, instead of producing the "Unknown command." message.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@3020 c06c8d41-db1a-0410-9941-cceddc491573
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