patch 8.1.1646: build failure

Problem:    build failure
Solution:   Add changes to structure.

Author: brammool

src/structs.h

@@ -2941,6 +2941,9 @@ struct window_S
     linenr_T	w_popup_lnum;	    // close popup if cursor not on this line
     colnr_T	w_popup_mincol;	    // close popup if cursor before this col
     colnr_T	w_popup_maxcol;	    // close popup if cursor after this col
+    int		w_popup_mouse_row;  // close popup if mouse moves away
+    int		w_popup_mouse_mincol;  // close popup if mouse moves away
+    int		w_popup_mouse_maxcol;  // close popup if mouse moves away
     int		w_popup_drag;	    // allow moving the popup with the mouse
     popclose_T	w_popup_close;	    // allow closing the popup with the mouse
 

src/version.c

@@ -777,6 +777,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1646,
 /**/
     1645,
 /**/