addpkg: svt-hevc, svt-vp9

[TinySnow]

These two package have same error: immintrin.h: No such file or directory.

I searched some talks, blogs, bugs or issues, finally ensured that this immintrin.h head file is for x86_64 architecture only.

Since I have no idea about how to avoid this troublesome error to let the package port successfully, so I just simply add these two packages to the blacklist.txt(below the Binary package that don't have RISC-V support) and REPORTED ITS UPSTREAM.

If there are any mistakes about the management, please dm me.

PERHAPS USEFUL LINKS:

• Compiling on aarch64: immintrin.h not found suijingfeng/vkQuake3#14 (comment)
• https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=262910#c3
• https://www.betamaster.us/blog/?p=1922

UPSTREAM ISSUE LINKS:

• [BUILD FAILED] Looking for some alternatives about immintrin.h OpenVisualCloud/SVT-HEVC#622
• [BUILD FAILED] Looking for some alternatives about immintrin.h OpenVisualCloud/SVT-VP9#159

[felixonmars]

Since they have sources available, they are definitely not "binary package"s and should not be added there.

IMHO they are just not ported yet, which doesn't belong to the blacklist.

[XieJiSS]

I suspect that at least the latter package can be built in compatibility mode, i.e. getting rid of AVX2/SSE. At least they do provide source code for this purpose: https://github.com/OpenVisualCloud/SVT-VP9/tree/d46acba4668817b2963fa55546a7b4f565c66120/Source/Lib/C_DEFAULT

[XieJiSS]

Also posting here to keep consistency:

I think removing https://github.com/OpenVisualCloud/SVT-VP9/blob/d46acba4668817b2963fa55546a7b4f565c66120/CMakeLists.txt#L227-L230 will make svt-vp9 build

[Xeonacid]

Close for now.