Remove Window objects from the corresponding Select.pWin list when they are

deleted, as they are, for example, when the ORDER BY clause is optimized out.

FossilOrigin-Name: f9c6e6a7102689b2a5cf32996a02853e346bcebaed6af0265a7422260fa3358c

src/sqliteInt.h

@@ -3604,6 +3604,7 @@ struct Window {
   u8 eExclude;            /* TK_NO, TK_CURRENT, TK_TIES, TK_GROUP, or 0 */
   Expr *pStart;           /* Expression for "<expr> PRECEDING" */
   Expr *pEnd;             /* Expression for "<expr> FOLLOWING" */
+  Window **ppThis;        /* Pointer to this object in Select.pWin list */
   Window *pNextWin;       /* Next window function belonging to this SELECT */
   Expr *pFilter;          /* The FILTER expression */
   FuncDef *pFunc;         /* The function */