src/xdisp.c: Remove unused parameters.

src/xdisp.c: Remove unused parameters.

* dispextern.h (move_it_by_lines):
* xdisp.c (move_it_by_lines): Remove parameter `need_y_p', unused
  since revno:34925 (2000-12-29).  All callers changed.
  (message_log_check_duplicate): Remove parameters `prev_bol' and
  `this_bol', unused since revno:20537 (1998-01-01).  All callers changed.
  (redisplay_internal): Remove parameter `preserve_echo_area',
  unused since revno:25013 (1999-07-21).  All callers changed.
* indent.c (Fvertical_motion):
* window.c (window_scroll_pixel_based, Frecenter):
  Don't pass `need_y_p' to `move_it_by_lines'.