When expanding "*" in the result set of a SELECT, do not attach a table name

to columns that are in subsequent USING clauses.

FossilOrigin-Name: 91530990e018580ec5322ace6f0c369a32a3529a0bfb4defb25ca20223a2a80f

src/sqliteInt.h

@@ -3090,6 +3090,7 @@ struct SrcItem {
     unsigned isCte :1;         /* This is a CTE */
     unsigned notCte :1;        /* This item may not match a CTE */
     unsigned isUsing :1;       /* u3.pUsing is valid */
+    unsigned isSynthUsing :1;  /* u3.pUsing is synthensized from NATURAL */
   } fg;
   int iCursor;      /* The VDBE cursor number used to access this table */
   union {