Don't include stdlib.h or composite.h.
(x_use_underline_position_properties, last_mouse_press_frame)
(x_noop_count, Qvendor_specific_keysyms): Remove unused variables.
(syms_of_macterm, mac_initialize): Don't initialize them.
(waiting_for_input, initial_argv, initial_argc)
(Vcommand_line_args, Vx_no_window_manager, errno, window_scroll)
(set_frame_menubar, path_from_vol_dir_name): Remove externs.
(extra_keyboard_modifiers): Fix type in extern.
(x_window_to_frame, x_window_to_scroll_bar): Remove declarations.
(x_scroll_bar_report_motion): Add argument types to declaration.
(mac_compute_glyph_string_overhangs): Add declaration.
(disable_mouse_highlight): Remove unused variable.
[USE_TOOLKIT_SCROLL_BARS] (construct_scroll_bar_click)
(x_scroll_bar_handle_press, x_scroll_bar_handle_release)
(x_scroll_bar_handle_drag): Remove argument `timestamp'. All
callers changed.
[USE_TOOLKIT_SCROLL_BARS] (construct_scroll_bar_click): Don't set
timestamp.
[USE_CARBON_EVENTS] (mac_handle_mouse_event): Likewise.
(x_scroll_bar_create, XTset_vertical_scroll_bar): Show scroll bar
only when its width is less than the height.
(XTredeem_scroll_bar): Sync with xterm.c.
(font_name_table, font_name_table_size, font_name_count): Make
static.
(drag_and_drop_file_list): Remove variable. Previous use is now
local to function.
(do_ae_open_documents): Move DRAG_N_DROP event construction part
from XTread_socket.
(XTread_socket): Consolidate setting of event timestamp. Move
DRAG_N_DROP event construction part to do_ae_open_documents.
Support extra_keyboard_modifiers.