git: 7b495a2a7abf..e188971328b0 - vendor/zlib - vendor branch updated

[Xin LI]

The branch vendor/zlib has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=7b495a2a7abf..e188971328b0

e188971328b0 Vendor import of zlib 1.2.13.