Fix Gtk warnings

Fix Gtk warnings

* src/gtkutil.c (xg_frame_set_char_size): Call appropriate function
(xg_set_undecorated): Do nothing if child frame.
(xg_set_no_focus_on_map): Do nothing if child frame.
(xg_set_no_accept_focus): Do nothing if child frame.
(xg_set_frame_icon): Do nothing if child frame.
(xg_get_file_name): Do nothing if child frame.
(xg_get_font):
* src/pgtkterm.c (pgtk_focus_frame): Do nothing if child frames.
(x_set_frame_alpha): Select correct widget.
(x_new_focus_frame): Focus only when non-child frames.
(pgtk_set_event_handler): Don't set for child frames.
* src/pgtkfns.c (xg_set_icon): Do nothing if child frames.
(xg_set_icon_from_xpm_data): Do nothing if child frames.
(pgtk_set_sticky): Do nothing if child frames.
(Fx_show_tip): Do nothing if child frames.
(Fpgtk_set_mouse_absolute_pixel_position): Select correct widget.
(Fpgtk_mouse_absolute_pixel_position): Select correct widget.
* src/pgtkmenu.c (pgtk_menu_show):
(pgtk_dialog_show):