Wine staging 5.21 release

[Alistair Leslie-Hughes]

Binary packages for various distributions will be available from:
https://www.winehq.org/download

Summary since last release
* Rebased to current wine 5.21 (737 patches are applied to wine vanilla)

Upstreamed (Either directly from staging or fixed with a similar patch).
* winegstreamer: Insert videoconvert into decoded-video streams.
* winegstreamer: Insert audioconvert into decoded audio streams.
* ntdll: Add stub for 
NtQuerySystemInformation(SystemExtendedProcessInformation).
* ntdll: Add stub for NtQuerySystemInformation(SystemModuleInformationEx).
* winegstreamer: Replace gst_pad_get_current_caps with gst_pad_query_caps.
* winegstreamer: Implement IMFMediaSource::CreatePresentationDescriptor.
* mfreadwrite: Abort ReadSample when unable to request any samples.
* winegstreamer: Implement IMFMediaSource::Start.
* winegstreamer: Implement IMFMediaStream::RequestSample.
* mfplat: Add I420 format information.
* mfmediaengine: Provide the partial topology to the media session.
* mfmediaengine: Issue MF_MEDIA_ENGINE_EVENT_CANPLAY upon 
MF_TOPOSTATUS_READY.
* mfmediaengine: Issue MF_MEDIA_ENGINE_EVENT_PLAYING upon MESessionStarted.
* mfmediaengine: Issue MF_MEDIA_ENGINE_EVENT_ENDED upon MESessionEnded.
* netutils: New DLL
* srvcli: New DLL
* mfmediaengine: Implement GetNativeVideoSize.
* winegstreamer:  Implement IMFMedisStream::GetMediaSource.

Added:
* None

Updated:
* ntdll-DOS_Attributes
* server-Stored_ACLs
* ntdll-Fix_Aligment
* bcrypt-ECDHSecretAgreement
* ntdll-Junction_Points
* widl-winrt-support
* dinput-remap-joystick
* mfplat-streaming-support
* msxml3-FreeThreadedXMLHTTP60
* ntdll-Syscall_Emulation

Where can you help
* Run Steam/Battle.net/GOG/UPlay/Epic
* Test your favorite game.
* Test your favorite applications.
* Improve staging patches and get them accepted upstream.

As always, if you find a bug, please report it via
https://bugs.winehq.org

Best Regards
  Alistair.