Apply paxed's DEBUG patch to remove DEBUG/D_DEBUG.

Apply paxed's DEBUG patch to remove DEBUG/D_DEBUG.

    Move debugging output into couple preprocessor defines, which
    are no-op without DEBUG.  To show debugging output from a
    certain source files, use sysconf:

    DEBUGFILES=dungeon.c questpgr.c

    Also fix couple debug lines which did not compile.

This also includes fixes due to Derek Ray to depugpline to work better
on other platforms.