Use all processors when installing zstd

[fahhem]

Description

Speeds up my builds from 93s to 37s (four core) for the install-zstd.sh step

Related issue:

None

Check list

• [n/a] Related issue / work item is attached
• [n/a] Tests are written (if applicable)
• [n/a] Documentation is updated (if applicable)
• Changes are tested and related VM images are successfully generated

[Kichura]

One question i have yet to ask: Is this change stable in CI aswell just like using zstd in single-threaded mode?

[fahhem]

This option has make run separate compilations in parallel. Since gcc doesn't communicate between running processes at all, this tends to be considered very safe. This project compiles other libraries in parallel, and I can pretty much guarantee that whoever compiles zstd for packaging also uses parallel compilation as well. However, you're more than welcome to run this in CI as much as you like to see if that's actually the case, I've run it a few times locally now as I've iterated on other things.

[fahhem]

@Kichura Can you approve it so the workflows can run and we can see if it's stable on CI?

[Kichura]

@Kichura Can you approve it so the workflows can run and we can see if it's stable on CI?

I am not a member of this repo, therefore i can't greenlight this but i will approve it cuz it's interesting.

[subir0071]

We are in the process of checking this PR.