direct3d11: only send the HDR metadata when they change
Newer Windows issue this warning if we send metadata with each picture: DXGI WARNING: IDXGISwapChain4::SetHDRMetaData: Redundant invocation on unchanged metadata could result in presentation performance inefficiency. [ MISCELLANEOUS WARNING #295: ] Similar code as done in 26954081 for VLC 4.0.
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