Wine-Bug: https://bugs.winehq.org/show_bug.cgi?id=53176
1) The async test is broken on Windows 10 1507. This appears to be a trend among WinRT dlls. I'm thinking that we can add macro definitions for each testbot VM to avoid having to skip tests that would otherwise be working fine, and just greater control over tests in general.
2) The provider file that contains `interface IWineAsyncInfoImpl` is likely going to be reused again in the future. Perhaps a new file can be added in the include/wine folder to prevent duplicate code? I can do this in a separate merge request and cleanup the existing provider files.
3) All the check_bool_async tests return a random async_id so I skipped them. Testbot example: https://testbot.winehq.org/JobDetails.pl?Key=127232&f208=exe32.report#k2...
-- v4: cryptowinrt/tests: Add IKeyCredentialManagerStatics_IsSupportedAsync tests.