Add the ability to disable the omit-join-table optimization for testing

purposes.

FossilOrigin-Name: d929df9b1ba214c27d8c437099a53ee9b07aa169

src/sqliteInt.h

@@ -1024,6 +1024,7 @@ struct sqlite3 {
 #define SQLITE_OrderByIdxJoin 0x0080   /* ORDER BY of joins via index */
 #define SQLITE_SubqCoroutine  0x0100   /* Evaluate subqueries as coroutines */
 #define SQLITE_Transitive     0x0200   /* Transitive constraints */
+#define SQLITE_OmitNoopJoin   0x0400   /* Omit unused tables in joins */
 #define SQLITE_AllOpts        0xffff   /* All optimizations */
 
 /*