[PATCH v4 0/3] MR3536: mfmediaengine: Implement media_engine_GetSeekable().

[Zhiyi Zhang (＠zhiyi)]

Needed by Underworld Island (Steam ID: 2150830) to skip videos properly.

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  v4: mfmediaengine: Implement media_engine_GetSeekable().
      mfmediaengine/tests: Test IMFMediaEngine::GetSeekable().
 
https://gitlab.winehq.org/wine/wine/-/merge_requests/3536