Don't include <fontconfig/fontconfig.h> here.

Don't include <fontconfig/fontconfig.h> here.
(Mserif, Msans_serif, Mmonospace, Mmedium, Mr, Mnull): New
variables.
(ft_family_list): New variable.
(set_font_info): New arg basep.  Callers changed.
(fc_list): Check the return value of FcPatternGetString.
(add_font_info): New arg plist.  Callers changed. Update
ft_family_list.
(ft_list_family): New function (merged fc_list and ft_list_all).
(ft_select): Use ft_list_family.
(ft_list): Likewise.  If FONT is not NULL, check all fonts.
(mfont__ft_init): Initialize above new variables.
(mfont__ft_fini): Free ft_family_list.