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/save.c

@@ -1210,9 +1210,7 @@ int fd, mode;
 	    }
 	    bwrite(fd, (genericptr_t) &minusone, sizeof(int));
 	}
-#ifdef DEBUG_MSGCOUNT
-	pline("Stored %d messages into savefile.", msgcount);
-#endif
+	debugpline("Stored %d messages into savefile.", msgcount);
 	/* note: we don't attempt to handle release_data() here */
 }