dev-libs/libzip: Add zstd dependency

[semajmail]

The version bump of dev-libs/libzip from 1.7.3 to 1.8.0 included support for zstd and libzip added it as a dependency, however this was missing from the ebuild.

[gentoo-bot]

Pull Request assignment

Submitter: @semajmail
Areas affected: ebuilds
Packages affected: dev-libs/libzip

dev-libs/libzip: @gentoo/kde

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[gentoo-repo-qa-bot]

Pull request CI report

Report generated at: 2022-02-25 05:46 UTC
Newest commit scanned: f44c99a
Status: ✅ good

There are existing issues already. Please look into the report to make sure none of them affect the packages in question:
https://qa-reports.gentoo.org/output/gentoo-ci/539109d1da/output.html

[thesamesam]

Thanks! I've added this with a revbump (git mv in this case) because without it, it'll be an automagic dependency (so if you don't have USE=zstd enabled, even after an emerge -uvDU @world update, you won't rebuild it without zstd support if zstd was installed at time of the original install), and could break e.g. binpkgs.