git: 14feafd16d12..a8fa7ccb4730 - vendor/expat - vendor branch updated

[Xin LI]

The branch vendor/expat has been updated by delphij:

URL: https://cgit.FreeBSD.org/src/log/?id=14feafd16d12..a8fa7ccb4730

a8fa7ccb4730 Vendor import of expat 2.7.3.