Remove unused declarations

Remove unused declarations

* src/buffer.c: Remove unused declarations.
* src/buffer.h: Likewise.
* src/charset.h: Likewise.
* src/composite.h: Likewise.
* src/dispextern.h: Likewise.
* src/dispnew.c: Likewise.
* src/font.h: Likewise.
* src/fontset.c: Likewise.
* src/fontset.h: Likewise.
* src/intervals.h: Likewise.
* src/keymap.h: Likewise.
* src/lisp.h: Likewise.
* src/syntax.c: Likewise.
* src/syntax.h: Likewise.
* src/termhooks.h: Likewise.
* src/window.h: Likewise.
* src/xsettings.h: Likewise.
* src/xterm.c: Likewise.
* src/xterm.h: Likewise.

* src/chartab.c (sub_char_table_ref): Make static.
* src/dispnew.c (line_hash_code, required_matrix_height)
(required_matrix_width): Likewise.
* src/eval.c (interactive_p, apply_lambda): Likewise.
* src/fns.c (string_make_multibyte, copy_hash_table, hash_clear):
Likewise.
* src/font.c (QCadstyle, QCregistry, font_make_spec)
(font_parse_fcname, font_encode_char, font_at): Likewise.
* src/frame.c (x_frame_get_arg): Likewise.
* src/keymap.c (get_keyelt): Likewise.
* src/lread.c (read_filtered_event): Likewise.
* src/print.c (write_string_1): Likewise.
* src/window.c (delete_window, window_height, window_width)
(foreach_window): Likewise.
* src/xrdb.c (x_get_customization_string, x_get_resource): Likewise.
* src/xterm.c (x_scroll_bar_clear, xembed_set_info)
(xembed_send_message): Likewise.

* src/eval.c (run_hook_list_with_args): Delete.
* src/font.c (font_unparse_gtkname, font_update_lface): Likewise.
* src/terminal.c (get_terminal_param): Likewise.
* src/xterm.c (x_alloc_lighter_color_for_widget): Likewise.