[TARGET_API_MAC_CARBON && !MAC_OSX]: Define USE_CARBON_EVENTS to 1.

[TARGET_API_MAC_CARBON && !MAC_OSX]: Define USE_CARBON_EVENTS to 1.
[__MRC__ && TARGET_API_MAC_CARBON]: Don't declare `qd'.
(x_free_frame_resources): Call remove_window_handler for non-tooltip
windows.
[TARGET_API_MAC_CARBON]: Don't include headers that are included via
Carbon.h.
[TARGET_API_MAC_CARBON] (mac_do_track_dragUPP)
(mac_do_receive_dragUPP): New variables.
(mac_handle_service_event, init_service_handler): Put declarations and
definitions in #ifdef MAC_OSX.
(install_window_handler) [TARGET_API_MAC_CARBON]: Create UPPs for
drag-and-drop handler functions and register them.
(remove_window_handler): New function.
(do_ae_open_documents, mac_do_receive_drag) [!MAC_OSX]: Use
fsspec_to_posix_pathname.
(main): Change #if !TARGET_API_MAC_CARBON to #ifdef MAC_OS8.
(XTread_socket) [!MAC_OSX]: Don't pass keyboard events to TSM.
[MAC_OS8] (make_mac_terminal_frame) [TARGET_API_MAC_CARBON]: Set
default cursors.
(mac_initialize) [USE_CARBON_EVENTS && !MAC_OSX] : Don't call
init_service_handler or init_quit_char_handler.
(mac_initialize) [!MAC_OSX]: Don't call MakeMeTheFrontProcess.