(fc_generic_family_list): Delete it.

(fc_generic_family_list): Delete it.
(Mserif, Msans_serif, Mmonospace): Delete them.
(M_generic_family_info): New variable.
(enum GenericFamilyType): New enum.
(struct GenericFamilyInfo): New struct.
(generic_family_table): New variable.
(set_font_info): New arg style. Don't check 0xA0..0xBF to decide
iso8859-1.
(add_font_info): Get style here.
(ft_list_family): Don't initialize fc_config here.  Don't list
generic families.
(ft_list_generic): New function.
(ft_select): Pay attention to generic familes here.
(ft_open): Fix calculation of ascent and descent.
(ft_list): Pay attention to generic families.
(mfont__ft_init): Initialize M_generic_family_info,
generic_family_table, and fc_config..
(mfont__ft_fini): Finalize generic_family_table.