git: 12eff5f0d8b7..762f11d98d5c - vendor/xz - vendor branch updated

[Xin LI]

The branch vendor/xz has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=12eff5f0d8b7..762f11d98d5c

762f11d98d5c Vendor import of xz 5.8.2 (trimmed)