Yet another attempt at fixing bugs #14602, 14630, 14669.
src/w32fns.c (w32_wnd_proc): Don't compute the header line and mode line dimensions here, to avoid race conditions with the main thread. src/w32term.c (w32_draw_window_cursor): Compute the header line and mode line dimensions here. <w32_system_caret_window, w32_system_caret_hdr_height>: <w32_system_caret_mode_height>: New variables. src/w32term.h: Declare them.
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