Ensure the Google Analytics code only runs when served from FreeBSD.org
or google.com servers.  This was always the intention, but due to a bug
it would also run when (for example) accessed via
http://www.freebsd.org.nyud.net.

Approved by:	webstats (eadler)


git-svn-id: svn+ssh://svn.freebsd.org/doc/head@45832 c2e8774f-c49f-e111-b436-862b2bbc8956