git: 039b23c9238c..a7819ed7ade8 - vendor/xz - vendor branch updated

[Xin LI]

The branch vendor/xz has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=039b23c9238c..a7819ed7ade8

a7819ed7ade8 Vendor import of xz 5.6.0 (trimmed)