MENU: delete dropload.c.
MENU: remove put_wait_box.
MENU: remove get_button_parent.
MENU: remove open_pull.
MENU: remove leaf_xoff.
MENU: remove pull_block.
MENU: remove which_sel and why_which_sel.
MENU: remove nframe_text.
MENU: remove tbg_closeonly.
MENU: remove menu_in_active_group.
MENU: remove set_input_wndo.
MENU: remove wait_menu_input.