Mark tests in "tests/lib_strong" as not strong-mode ready

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 == false ]
 *: SkipByDesign
 
 # Skip tests that are not yet strong-mode clean.
 [ $strong ]
+async/async_await_sync_completer_test: Skip
+async/async_await_zones_test: Skip
+async/catch_errors2_test: Skip
+async/catch_errors3_test: Skip
+async/catch_errors_test: Skip
+async/future_microtask_test: Skip
+async/future_or_bad_type_test_00_multi: Skip
+async/future_or_bad_type_test_01_multi: Skip
+async/future_or_only_in_async_test_00_multi: Skip
+async/future_test_none_multi: Skip
+async/future_test_01_multi: Skip
+async/future_value_chain4_test: Skip
+async/print_test_01_multi: Skip
+async/print_test_none_multi: Skip
+async/slow_consumer3_test: Skip
+async/stream_controller_test: Skip
+async/stream_event_transformed_test: Skip
+async/stream_transformer_test: Skip
+async/zone_debug_test: Skip
 convert/chunked_conversion1_test: Skip
 convert/chunked_conversion_json_encode1_test: Skip
 convert/chunked_conversion_utf84_test: Skip
 convert/chunked_conversion_utf88_test: Skip
 convert/chunked_conversion_utf8_test: Skip
 convert/line_splitter_test: Skip
 html/cross_frame_test: Skip
 html/element_dimensions_test: Skip
 html/element_test: Skip
 html/events_test: Skip
@@ skipping 112 matching lines @@
 typed_data/int32x4_test: Skip
 
 [ $compiler == dart2analyzer && $strong ]
 html/custom/created_callback_test: CompileTimeError # Issue 28969
 html/custom/document_register_basic_test: CompileTimeError # Issue 28969
 html/custom/document_register_type_extensions_test: CompileTimeError # Issue 28969
 html/custom/element_upgrade_test: CompileTimeError # Issue 28969
 html/debugger_test: CompileTimeError # Issue 28969
 html/js_typed_interop_default_arg_test/default_value: MissingCompileTimeError # Issue 28969
 mirrors/deferred_mirrors_metadata_test: StaticWarning # Issue 28969