zen-browser-avx2: add version 1.0.0-a.39

[alessandroberna]

Adds the Zen Browser version optimized for x86_64-v3 cpus. Zen Browser is an open-source, privacy-focused web browser with a focus on speed and user experience.

There are two Zen windows builds: a generic one and one optimized for x86-64-v3. The optimized version leverages AVX2 and should provide a nice speedup for compatibile cpus.

This is based on this PR on the Extras bucket, which only provides the generic build.

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[github-actions[bot]]

All changes look good.

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zen-browser-avx2

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