Don't include FT_FREETYPE_H here.

Don't include FT_FREETYPE_H here.
[HAVE_XFT2]: Include <fontconfig/fontconfig.h>.
(fontconfig_initialized, fc_config) [HAVE_XFT2]: New variables.
(MFTInfo): New member charmap_index.
(MFTInfo) [HAVE_XFT2]: New member xft_info.
(check_otf_filename): Renamed from check_filename.  Return value
changed.
(ft_set_property): This function deleted.
(set_font_info): New function.
(add_font_list): Argument changed.  Add multiple fonts.
(xft_list) [HAVE_XFT2]: New function.
(ft_list) [not HAVE_XFT2]: New function.
(ft_select): Add code for Xft.
(close_ft): Likewise.
(ft_open): Likewise.
(ft_find_metric): Likewise.
(ft_encode_char): Likewise.
(ft_render): Likewise.