libblake3: 1.6.1 -> 1.7.0; enable TBB multi-threading support

[silvanshade]

This PR updates the version to 1.7.0 and enables recent TBB multi-threading support for libblake3.

• Built on platform(s)
  • x86_64-linux

@fgaz

[fgaz]

Thanks! Looks good except for the comments I left. Also as you write let's wait for a release

[silvanshade]

@fgaz Release 1.7.0 is published which enables this feature.

[silvanshade]

One question I have about the tbb dependency: libblake3 supports at least tbb version 2021_11 but here I've opted to use the latest available in nixpkgs which is 2022_0.

However, I've noticed that version 2022_0 doesn't seem to be available yet for nix (building via the flake), where I intend to use this feature.

I suppose maybe it doesn't matter because nix would still need to update nixpkgs in order to have access to the current libblake3 (or specify a custom local package where it doesn't matter) so at that point the latest tbb should also be available.

Any thoughts on this?

[Ericson2314]

@silvanshade You can backport the tbb version you need to 24.11 as a new package. I think that should unblock you?