message: Fix length-prefix framing tests on Windows
diff: @@ -111,6 +111,8 @@ auto decode(byte_buffer& buf) {
  } // namespace
  +BEGIN_FIXTURE_SCOPE(host_fixture)
  +
  SCENARIO("length-prefix framing reads data with 32-bit size headers") {
  GIVEN("a length_prefix_framing with an app that consumes strings") {
  WHEN("pushing data into the unit-under-test") {
  @@ -194,3 +196,5 @@ SCENARIO("calling suspend_reading removes message apps temporarily") {
  writer.join();
  }
  }
  +
  +END_FIXTURE_SCOPE()
  