Include "buffer.h".

Include "buffer.h".
(fs_load_font): If the face has fontset, record the face ID in
that fontset.
(Finternal_char_font): New function.
(accumulate_font_info): New function.
(Ffontset_info): Rewritten for the new fontset implementation.
(syms_of_fontset): Register Vdefault_fontset in the first element
of Vfontset_table.  Include Vdefault_fontset in
Vfontset_alias_alist.  Declare `internal-char-font' as a Lisp
function.