remove the so-called advertising clause from these files' license,
making it compatible with the Debian Free Software Guidelines.  As
these files were obtained from FreeBSD, this change was discussed
with and approved by the FreeBSD core team.

git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@1208 d4fa192b-c00b-0410-8231-f00ffab90ce4