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.

sys/unix/sysconf

@@ -14,6 +14,11 @@ WIZARDS=root games
 # Uses the same syntax as the WIZARDS option above.
 #SHELLERS=
 
+# Show debugging information originating from these source files.
+# Use '*' for all, or list source files separated by spaces.
+# Only available if game has been compiled with DEBUG.
+#DEBUGFILES=*
+
 # Limit the number of simultaneous games (see also nethack.sh).
 MAXPLAYERS=10