Copy a42b74ae8139738a14148f94543c659ec2d5b92b from libxev

[Jarred-Sumner]

What does this PR do?

Copy the code from these

• Don't use SEND_ONCE mach rights for async, use a queue limit of 1 mitchellh/libxev#102
• https://github.com/ghostty-org/ghostty/issues/1836

How did you verify your code works?

[github-actions]

❌ @Jarred-Sumner, your commit has failing tests :(

💪 1 failing tests Darwin AARCH64

• test/js/web/workers/worker.test.ts 1 failing

🐧🖥 1 failing tests Linux x64

• test/cli/install/registry/bun-install-registry.test.ts 1 failing

🪟💻 2 failing tests Windows x64 baseline

• test/cli/install/bun-add.test.ts 1 failing
• test/cli/install/registry/bun-install-registry.test.ts 1 failing

🪟💻 1 failing tests Windows x64

• test/cli/install/bun-add.test.ts 1 failing

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