patch 8.2.4052: not easy to resize a window from a plugin

Problem:    Not easy to resize a window from a plugin.
Solution:   Add win_move_separator() and win_move_statusline() functions.
            (Daniel Steinberg, closes #9486)
diff --git a/src/proto/evalwindow.pro b/src/proto/evalwindow.pro
index eba1676..b2f8981 100644
--- a/src/proto/evalwindow.pro
+++ b/src/proto/evalwindow.pro
@@ -18,6 +18,8 @@
 void f_win_gotoid(typval_T *argvars, typval_T *rettv);
 void f_win_id2tabwin(typval_T *argvars, typval_T *rettv);
 void f_win_id2win(typval_T *argvars, typval_T *rettv);
+void f_win_move_separator(typval_T *argvars, typval_T *rettv);
+void f_win_move_statusline(typval_T *argvars, typval_T *rettv);
 void f_win_screenpos(typval_T *argvars, typval_T *rettv);
 void f_win_splitmove(typval_T *argvars, typval_T *rettv);
 void f_win_gettype(typval_T *argvars, typval_T *rettv);