(handling_window_update, terminate_flag): Remove variables.

(handling_window_update, terminate_flag): Remove variables.
(do_window_update, do_ae_quit_application, XTread_socket): Don't
use them.
(WNE_SLEEP_AT_SUSPEND, WNE_SLEEP_AT_RESUME): Don't define.
[USE_CARBON_EVENTS && MAC_OSX] (mac_handle_service_event)
(init_service_handler): Move to macselect.c.  Remove declarations.
[USE_CARBON_EVENTS && MAC_OSX] (init_service_handler): Add extern.
(Qapplication, Qabout): New variables.
(syms_of_mac): Initialize them.
[USE_CARBON_EVENTS && MAC_OSX] (Qpreferences, Qservices, Qpaste)
(Qperform): New variables.
(syms_of_mac) [USE_CARBON_EVENTS && MAC_OSX]: Initialize them.
(do_get_menus) [!TARGET_API_MAC_CARBON]: Don't call AppendResMenu.
(do_menu_choice): Unhighlight menu bar also when menu_id is 0.
(mac_store_application_menu_event, init_menu_bar): New functions.
[USE_CARBON_EVENTS] (mac_handle_command_event)
(init_command_handler): New functions.
(mac_handle_window_event): Return noErr on window update event.
(do_ae_quit_application): Call mac_store_application_menu_event.
(mac_initialize) [USE_CARBON_EVENTS]: Call init_command_handler
and init_menu_bar.