Enable DEFENSIVE mode by default for tests. This requires lots of case of

turning DEFENSIVE off in order to dodgy things to the database for testing
purposes.  No all of those cases are yet handled, so "make test" does not run
to completion.

FossilOrigin-Name: a1d6c6712c3304fd736077432c8c180692cf7d79be7f3a073510b6dab0eb951f

ext/rtree/rtreeA.test

@@ -36,6 +36,7 @@ proc populate_t1 {} {
     execsql { INSERT INTO t1 VALUES($i, $i, $x2, $i, $y2) }
   }
   execsql COMMIT
+  sqlite3_db_config db DEFENSIVE 0
 }
 
 proc truncate_node {nodeno nTrunc} {
@@ -246,6 +247,7 @@ do_execsql_test rtreeA-6.2 {
 create_t1
 populate_t1
 sqlite3 db test.db
+sqlite3_db_config db DEFENSIVE 0
 do_execsql_test rtreeA-7.100 { 
   UPDATE t1_node SET data=x'' WHERE rowid=1;
 } {}
@@ -258,4 +260,3 @@ do_test rtreeA-7.120 {
 
 
 finish_test
-