This was updated on 2013-07-01 with
/mit/snippets/git-hooks/zephyr-post-receive, commit
0a6422ec6a30429215c4a93dd5a40799712c09b0.

It is symlinked from hooks/post-receive in some of the git repos in this
directory. As of 2013-07-01, these are:
- xen.git
- wizard.git
- httpd.git
- autoinstalls/
    - mediawiki.git
    - phpBB.git
    - wordpress.git