Fixups, following up to the user-interface timestamp change.
* nsterm.m (last_mouse_movement_time, ns_mouse_position): Use Time
for UI timestamps, instead of unsigned long.
+ * msdos.c (mouse_get_pos): Likewise.
+ * w32inevt.c (movement_time, w32_console_mouse_position): Likewise.
* w32gui.h (Time): Define by including "systime.h" rather than by
declaring it ourselves. (Bug#8664)