On Windows and DOS, prompt for a newline after printing an error message and exiting, since users on those systems seem to run executables by double-clicking on them, and cannot see error messages because the console disappears when the game exits.
git-svn-id: https://crawl-ref.svn.sourceforge.net/svnroot/crawl-ref/trunk@1198 c06c8d41-db1a-0410-9941-cceddc491573
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