* src/boards/Makefile.mingw: added missing file for gnuchess
	* src/boards/chess.c: (start_child): cleanup.
	* src/boards/draw.c: (tool_event), (load_drawing), (save_drawing): reitroduced for windows version. removed load/save capapility.
	* src/gcompris/assetml.c: (dump_asset), (assetml_load_xml): fixed null pointer in display dump.
	* src/gcompris/board.c: (init_plugins): added draw
	* src/gcompris/soundutil.c: (gcompris_play_ogg) now returns if sound is null
	* src/gcompris/config.c: code cleanup