feat: remove unused crosscompile target and gox dependency

[kruskall]

Proposed commit message

gox has been archived and is no longer maintained

the crosscompile target is not used anymore

it was initially added in the travis era, later ported over in buildkite and removed in #43406

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• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

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[github-actions]

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[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @kruskall? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-8./d is the label to automatically backport to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[elasticmachine]

Pinging @elastic/sec-windows-platform (Team:Security-Windows Platform)

[elasticmachine]

Pinging @elastic/sec-linux-platform (Team:Security-Linux Platform)

[elasticmachine]

Pinging @elastic/elastic-agent-data-plane (Team:Elastic-Agent-Data-Plane)

[elasticmachine]

Pinging @elastic/sec-deployment-and-devices (Team:Security-Deployment and Devices)

[mauri870]

Thanks for this! I have a PR removing some of the mitchellh dependencies and Gox was the remaining one, since it was a tool I did not bother removing it. Good to know that it can also be removed.

[v1v]

I'm not much familiar with the usage of GOX_FLAGS, but I wonder whether the packaging DRA or so needs to be executed to validate whether these changes have any impact?

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b feat/drop-gox upstream/feat/drop-gox
git merge upstream/main
git push upstream feat/drop-gox

[kruskall]

@elastic/beats-tech-leads @elastic/observablt-ci @elastic/observablt-ci-contractors @elastic/sec-linux-platform @elastic/sec-windows-platform friendly ping for review

[kruskall]

@elastic/sec-windows-platform @elastic/sec-linux-platform friendly ping for review

[v1v]

approved - I only reviewed the BK pieces

[kruskall]

@elastic/sec-windows-platform @elastic/sec-linux-platform friendly ping for review

[kruskall]

@elastic/sec-windows-platform @elastic/sec-linux-platform friendly ping for review

[pierrehilbert]

@nfritts could you please take a look here?