git: bbf0e6b90032..46780ea2dc97 - vendor/xz - vendor branch updated

[Xin LI]

The branch vendor/xz has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=bbf0e6b90032..46780ea2dc97

46780ea2dc97 Vendor import of xz 5.2.9 (trimmed)