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/apply.c

@@ -1773,9 +1773,7 @@ long timeout;
 	char monnambuf[BUFSZ], carriedby[BUFSZ];
 
 	if (!figurine) {
-#ifdef DEBUG
-	    pline("null figurine in fig_transform()");
-#endif
+	    debugpline("null figurine in fig_transform()");
 	    return;
 	}
 	silent = (timeout != monstermoves); /* happened while away */