patch 9.0.0825: cannot drag an entry in the tabpage line

Problem:    Cannot drag an entry in the tabpage line.
Solution:   Clear dragwin instead of got_click. (closes #11483,
            closes #11482)
diff --git a/src/proto/mouse.pro b/src/proto/mouse.pro
index 6597689..7ce470c 100644
--- a/src/proto/mouse.pro
+++ b/src/proto/mouse.pro
@@ -1,7 +1,6 @@
 /* mouse.c */
 void mouse_set_vert_scroll_step(long step);
 void mouse_set_hor_scroll_step(long step);
-void reset_mouse_got_click(void);
 int do_mouse(oparg_T *oap, int c, int dir, long count, int fixindent);
 void ins_mouse(int c);
 void ins_mousescroll(int dir);
@@ -13,6 +12,7 @@
 void setmouse(void);
 int mouse_has(int c);
 int mouse_model_popup(void);
+void reset_dragwin(void);
 int jump_to_mouse(int flags, int *inclusive, int which_button);
 void nv_mousescroll(cmdarg_T *cap);
 void nv_mouse(cmdarg_T *cap);