(build_font_list): Don't set property[MFONT_TYPE].

(build_font_list): Don't set property[MFONT_TYPE].
(xft_driver): New variable.
(xft_select, close_xft, xft_open_font, xft_open, xft_close)
(xft_find_metric, xft_render): New function.
(mwin__init): Adjusted for the new mfont__driver_list.
(mwin__open_device): Assume arg PARAM is not NULL.  Push a newly
generated face to PARAM.
(mwin__realize_face): Fix setting of box colors.  Don't call hook
function here.
(mwin__draw_hline): New function.
(mwin__xft_close, mwin__xft_open, mwin__xft_get_metric)
(mwin__xft_render): Delete these function.