Ensure that variables are not used in the WINDOW clause of a query inside

of a trigger.  dbsqlfuzz d9cf66100064952b66951845dfab41de1c124611

FossilOrigin-Name: 1a341378ab24a5091e6cf03b9e957d11b2bfe5c711835e8c583785f8fa0125d3

src/sqliteInt.h

@@ -3833,6 +3833,7 @@ struct Walker {
   void (*xSelectCallback2)(Walker*,Select*);/* Second callback for SELECTs */
   int walkerDepth;                          /* Number of subqueries */
   u16 eCode;                                /* A small processing code */
+  unsigned bWalkWinDefn : 1;                /* True to walk pWinDefn */
   union {                                   /* Extra data for callback */
     NameContext *pNC;                         /* Naming context */
     int n;                                    /* A counter */