currently it's locked behind _MSC_VER, but anything that runs on Win32
should be able to use those functions as long as it has something that
can pass as a debug window.
also, add a non-wildcard-accepting version of showdebug for the dumpit()
functions in dungeon.c and questpgr.c; this makes DEBUGFILES=* workable
without being excruciatingly painful
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