win32: only load system DLL's from %windows%\system32

Similar to ba108368 for the other system DLL's.

The SetDefaultDllDirectories(LOAD_LIBRARY_SEARCH_SYSTEM32); call still allows DLL's from the VLC or app folder. But these system DLL's should only come from the system.

We don't need wide char names for ASCII DLL names. LoadLibraryExA/LoadLibraryExW are equally available on Windows and UWP (since 19H1).

The DXVA/D3D9/DMO have not been patched as they should not use LoadLibrary anymore.

changed milestone to %4.0

added Platform::Windows desktop label

changed the description

added MRStatus::Reviewable label

added MRStatus::NotCompliant label and removed MRStatus::Reviewable label

added 49 commits

• 97515fcf...b19ddcc9 - 43 commits from branch videolan:master
• 92b352e1 - d3d11_fmt: only load DXGIDEBUG.DLL from %windows%\system32
• c7e00bd5 - d3d11_fmt: only load d3d11_1sdklayers.dll from %windows%\system32
• a391f817 - mft_d3d: only load mfplat.dll from %windows%\system32
• 53e72e18 - direct3d9: only load D3dx9_XX.dll from %windows%\system32
• ca510fbc - wgl: only load opengl32.dll from %windows%\system32
• 35455efc - amf_helper: only load amfrt64.dll from %windows%\system32

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added MRStatus::Reviewable label and removed MRStatus::NotCompliant label

added MRStatus::Accepted label and removed MRStatus::Reviewable label

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enabled an automatic merge when all merge checks for a926c055 pass

added 14 commits

• 35455efc...9ab3f7da - 8 commits from branch videolan:master
• 833641de - d3d11_fmt: only load DXGIDEBUG.DLL from %windows%\system32
• 57570b45 - d3d11_fmt: only load d3d11_1sdklayers.dll from %windows%\system32
• aaaaa7dc - mft_d3d: only load mfplat.dll from %windows%\system32
• d57d4751 - direct3d9: only load D3dx9_XX.dll from %windows%\system32
• 07ac5669 - wgl: only load opengl32.dll from %windows%\system32
• a926c055 - amf_helper: only load amfrt64.dll from %windows%\system32

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merged