fix #30330, don't ignore cast failures in DDC for language/lib tests

tests/lib_strong/lib_strong.status

 # Copyright (c) 2016, the Dart project authors.  Please see the AUTHORS file
 # for details. All rights reserved. Use of this source code is governed by a
 # BSD-style license that can be found in the LICENSE file.
 
 # Skip entire suite if not running in strong mode.
 [ ! $strong ]
 *: SkipByDesign
 
 # Skip tests that are not yet strong-mode clean.
 [ $strong ]
@@ skipping 316 matching lines @@
 mirrors/typedef_metadata_test: RuntimeError # Issue 29922
 mirrors/typedef_test: RuntimeError # Issue 29922
 mirrors/typevariable_mirror_metadata_test: RuntimeError # Issue 29922
 mirrors/unnamed_library_test: RuntimeError # Issue 29922
 typed_data/int32x4_bigint_test: RuntimeError # Issue 29922
 typed_data/int64_list_load_store_test: RuntimeError # Issue 29922
 typed_data/typed_data_hierarchy_int64_test: RuntimeError # Issue 29922
 typed_data/typed_data_list_test: RuntimeError # Issue 29922
 html/interactive_test: Skip # requests interactive permissions (camera, geolocation)
 
+async/stream_controller_async_test: RuntimeError # Issue 29922, strong mode cast failure
+async/stream_join_test: RuntimeError # Issue 29922, strong mode cast failure
+async/stream_subscription_as_future_test: RuntimeError # Issue 29922, strong mode cast failure
+async/stream_transformer_from_handlers_test: RuntimeError # Issue 29922, strong mode cast failure
+async/zone_bind_callback_test: RuntimeError # Issue 29922, strong mode cast failure
+async/zone_register_callback_test: RuntimeError # Issue 29922, strong mode cast failure
+convert/encoding_test: RuntimeError # Issue 29922, strong mode cast failure
+convert/streamed_conversion_json_utf8_decode_test: RuntimeError # Issue 29922, strong mode cast failure
+convert/streamed_conversion_json_utf8_encode_test: RuntimeError # Issue 29922, strong mode cast failure
+convert/streamed_conversion_utf8_decode_test: RuntimeError # Issue 29922, strong mode cast failure
+convert/streamed_conversion_utf8_encode_test: RuntimeError # Issue 29922, strong mode cast failure
+html/indexeddb_1_test/functional: RuntimeError # Issue 29922, strong mode cast failure
+html/indexeddb_2_test: RuntimeError, Timeout # Issue 29922, strong mode cast failure
+html/xhr_test/xhr: RuntimeError # Issue 29922, strong mode cast failure
+
 [ $compiler == dartdevc && $runtime == chrome ]
 html/css_test: RuntimeError # Issue 29922
 html/element_animate_test/timing_dict: RuntimeError # Issue 29922
 html/element_types_test: RuntimeError # Issue 29922
 html/touchevent_test: RuntimeError # Issue 29922
 
 [ $compiler == dartdevc && $runtime == drt ]
 html/svg_test: RuntimeError # Issue 29922
 math/math_test: RuntimeError # Issue 29922
 math/math2_test: RuntimeError # Issue 29922
 
 [ $compiler == dartdevc && $system == windows ]
 convert/json_pretty_test: RuntimeError # Issue 30336
 html/xhr_test/xhr: Skip # Times out. Issue 21527