(XDrawLine): Rename from mac_draw_line_to_pixmap.

(XDrawLine): Rename from mac_draw_line_to_pixmap.
(XCreateGC): Change type of 2nd argument to void *.
(XFreeGC) [USE_CG_DRAWING && MAC_OS_X_VERSION_MAX_ALLOWED >= 1030]:
Fix last change.
(mac_to_emacs_modifiers): Change return type to int.
[USE_CARBON_EVENTS] (mac_event_to_emacs_modifiers): Likewise.
(mac_mapped_modifiers): New function.
(XTread_socket): Use it.
[USE_TSM] (mac_handle_text_input_event): Likewise.
(do_window_update) [USE_CG_DRAWING]: Call mac_prepare_for_quickdraw.
(mac_quit_char_modifiers, mac_quit_char_keycode) [MAC_OSX]: Remove
variables.
(mac_determine_quit_char_modifiers, init_quit_char_handler)
[MAC_OSX]: Remove functions.
(make_ctrl_char) [MAC_OSX]: Add extern.
(mac_quit_char_key_p) [MAC_OSX]: New function.
(mac_initialize) [MAC_OSX]: Don't call init_quit_char_handler.