Use OpenSSL 3.6.4 for musl builds

[copyberry]

Use OpenSSL 3.6.4 for musl builds

Why

The latest openssl-src 300.x crate still bundles OpenSSL 3.6.3. Build the 3.6.4 security release directly while preserving the existing 3.x ABI.

What changed

• Build static OpenSSL libraries with the musl compiler for x86_64 and aarch64, verifying the source archive's SHA-256 checksum.
• Set target-specific OpenSSL overrides to bypass vendored builds without affecting host build dependencies.
• Add perl and make to the musl build prerequisites and reuse completed OpenSSL installations.

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[github-actions]

Thank you for your submission, we really appreciate it. Like many open-source projects, we ask that you sign our Contributor License Agreement before we can accept your contribution. You can sign the CLA by just posting a Pull Request Comment same as the below format.

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I have read the CLA Document and I hereby sign the CLA

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_{You can retrigger this bot by commenting recheck in this Pull Request. Posted by the CLA Assistant Lite bot.}