Update Zopfli and several other depenencies #512
Merged
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I've just published a new Zopfli release, v0.7.3, which includes several new features and internal refactors. Performance should be a tad bit better, but I didn't test it throughly, so YMMV. Perhaps more importantly for OxiPNG, its dependency tree is smaller, and Gzip-exclusive compression code can be excluded at compile time thanks to new feature switches. As I mentioned on #495 (comment), I plan on delivering more significant Zopfli performance improvements at some point, but for now I think it's good to give the new release more real-world usage and testing 😄
While at it, I've upgraded other dependencies that are not performance-critical to their latest semver-compatible versions. This excludes
libdeflater
on purpose, as its performance characteristics are said to be somewhat different.