Allow bzip2 0.6

[musicinmybrain]

This release switches to libbz2-rs-sys as the default bzip2 backend. This rust implementation does not export C symbols by default. There are otherwise no API changes.

https://github.com/trifectatechfoundation/bzip2-rs/releases/tag/v0.6.0

[milesgranger]

I see this, thank you. I'm quite busy this week - hope to have time in between the upcoming holidays. :)

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Just seeing it's (obviously) the sad C-API tests, guess it can hopefully just be a matter of updating the feature flags to include the exported C symbols when that feature is enabled.

[musicinmybrain]

I see this, thank you. I'm quite busy this week - hope to have time in between the upcoming holidays. :)

No hurry; I’m patching this downstream in Fedora, and this PR is just me offering the change upstream.

Just seeing it's (obviously) the sad C-API tests, guess it can hopefully just be a matter of updating the feature flags to include the exported C symbols when that feature is enabled.

Hmm, I only see the macos-13-* checks “failing” because “The macOS-13 based runner images are now retired.”