Startup and lock counts in native Windows are separate, and the lock count does not decrease when an async result is freed if the platform has been started.
-- v4: rtworkq: Introduce an async result object cache. rtworkq: Introduce a platform startup count. rtworkq/tests: Test work queue. mfplat/tests: Test platform startup and lock counts. mfplat/tests: Test mixing of MF platform functions with their Rtwq equivalents. mfplat/tests: Introduce a helper to check the platform lock count.