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Delete X11 conditionals.

(defined_color, x_decode_color, x_set_foreground_color)
(x_set_background_color, x_set_mouse_color, x_set_cursor_color)
(x_set_border_color, x_set_border_pixel, Fx_create_frame)
(Fx_open_connection, Fx_close_current_connection, syms_of_xfns):
Delete X10 code.
(Fx_get_default, Fx_get_resource, Fx_rubber_band)
(Fx_store_cut_buffer, Fx_get_cut_buffer): Delete X10 definitions.