git: befc3e504def..c144cc54795d - vendor/zlib - vendor branch updated

[Xin LI]

The branch vendor/zlib has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=befc3e504def..c144cc54795d

c144cc54795d Vendor import of zlib 1.2.12.