vlang 0.5.1

[GunniBusch]

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fixes #271335

Rebased the existing gc patch and added a zstd type-compatibility patch so vlang 0.5.1 builds with current Clang toolchains.

[botantony]

Did you notify the upstream about this problem? Is there an issue or related PR?

[GunniBusch]

Did you notify the upstream about this problem? Is there an issue or related PR?

I just found this issue vlang/v#24711 but no real solution