(FONT_NOT_OPENED, FONT_NOT_FOUND): Macros removed.

(FONT_NOT_OPENED, FONT_NOT_FOUND): Macros removed.
(struct fontset_info, struct fontset_data): Structs removed.
(allloc_fontset_data, free_fontset_data, fs_regiser_fontset,
Vglobale_fontset_alist, font_idx_temp): Externs removed.
(fs_load_font, fs_query_fontset): Adjusted for new argument.
(fs_free_face_fontset, fontset_font_pattern,
face_suitable_for_char_p, face_for_char,
make_fontset_for_ascii_face): Extern them.
(FS_LOAD_FONT): Adjusted for the change of fontset implementation.
(FS_LOAD_FACE_FONT): New macro.