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zlib: Allow zlib.gunzip features with zlib.unzip

Rodrigo Muino Tomonari requested to merge github/fork/addaleax/allow-gunzip-features-with-unzip into master

Pull Request check-list

  • Does make -j8 test (UNIX) or vcbuild test nosign (Windows) pass with this change (including linting)?
  • Is the commit message formatted according to CONTRIBUTING.md?
  • If this change fixes a bug (or a performance problem), is a regression test (or a benchmark) included?

Affected core subsystem(s)

zlib

Description of change

Detect whether a gzip file is being passed to unzip* by testing the first bytes for the gzip magic bytes, and setting the decompression mode to GUNZIP or INFLATE according to the result.

This enables gzip-only features like multi-member support to be used together with the unzip* autodetection support and thereby makes gunzip* and unzip* return identical results for gzip input again.

This is more or less a follow-up change to #5120.

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