git: d6f77d3cfa8e..51c823ac2777 - vendor/libarchive - vendor branch updated

[Martin Matuska]

The branch vendor/libarchive has been updated by mm:

URL: https://cgit.FreeBSD.org/src/log/?id=d6f77d3cfa8e..51c823ac2777

51c823ac2777 Cherry-pick commits from libarchive to vendor/libarchive