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v2: winegstreamer: Request the wm_reader stream only when necessary.
winegstreamer: Introduce a new async_reader_wait_pts helper.
winegstreamer: Factor async_reader waits using async_reader_get_wait_timeout.
winegstreamer: Check whether the reader is still running before user time.
winegstreamer: Keep start time in the async_reader struct.
winegstreamer: Implement async reader asynchronous seeking.
winegstreamer: Unconditionally assign new context for ASYNC_OP_START.
winegstreamer: Wrap async reader op new_context in a union.
wmvcore/tests: Add some tests starting WM reader with NULL context.
https://gitlab.winehq.org/wine/wine/-/merge_requests/803