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This is similar to what we have on X.  Quickly tested by Dani Moncayo.
* w32fns.c (toplevel): Remove hourglass_hwnd; no longer used.
(w32_show_hourglass, w32_hide_hourglass, w32_note_current_window):
Likewise.
(hide_hourglass, show_hourglass): Redesign to match X counterparts.
* xdisp.c (start_hourglass): Remove Windows-specific bits.