Include "symbol.h".

Include "symbol.h".
(close_ft): Unconditionally free filename and charmap_list of
ft_into.
(ft_open): Duplicate base->filename.  Increment ref-count of
ft_info->charmap_list.  Free ft_info->charmap_list and
ft_info->filename on error.
(mfont__ft_parse_name, mfont__ft_unparse_name): New functions.