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.

src/teleport.c

@@ -121,9 +121,7 @@ unsigned entflags;
     struct monst fakemon;	/* dummy monster */
 
     if (!mdat) {
-#ifdef DEBUG
-	pline("enexto() called with mdat==0");
-#endif
+	debugpline("enexto() called with mdat==0");
 	/* default to player's original monster type */
 	mdat = &mons[u.umonster];
     }