takes benefit of tests/syntax/test_config options

tests/syntax/Refresh_visitor.i

tests/syntax/clone_test.i

tests/syntax/enum_repr.i

tests/syntax/forloophook.i

tests/syntax/formals_decl_leak.i

tests/syntax/get_astinfo_bts1136.i

tests/syntax/ghost_parameters_formals_status.i

tests/syntax/inserted_casts.c

tests/syntax/logic_env.i

tests/syntax/mutable_test.i

tests/syntax/reorder.i

tests/syntax/syntactic_hook.i

tests/syntax/temporary_location.c

tests/syntax/transient_block.i

tests/syntax/typedef_multi_1.c

tests/syntax/vdescr_bts1387.i

tests/syntax/visit_create_local.i