(XTread_socket) [TARGET_API_MAC_CARBON]: Try window

(XTread_socket) [TARGET_API_MAC_CARBON]: Try window
path select also for proxy icon click.
[TARGET_API_MAC_CARBON] (mac_post_mouse_moved_event): New function.
[USE_TOOLKIT_SCROLL_BARS] (scroll_bar_timer_callback): Use it.
(xlfdpat_create): Remove unused label `error' and trailing sentences.
(mac_do_track_drag, mac_do_receive_drag): Move functions to macselect.c.
(mac_do_track_dragUPP, mac_do_receive_dragUPP): Move variables to
macselect.c.
(install_drag_handler, remove_drag_handler): Add extern.
(mac_store_apple_event): Change return type to void.  All uses changed.
Create Lisp object from Apple event and store it into input event.
(mac_make_lispy_event_code): Remove function.
[TARGET_API_MAC_CARBON] (mac_store_drag_event): New function.
(install_window_handler): Call install_drag_handler.
(remove_window_handler): Call remove_drag_handler.