unused, "how" argument flag.

We currently have far too many "quote this string properly" implementations
in varnish, hopefully, this will replace most of them.

Once this stabilizes, vsb_quote() will be contributed back to FreeBSD.




git-svn-id: http://www.varnish-cache.org/svn/trunk/varnish-cache@3515 d4fa192b-c00b-0410-8231-f00ffab90ce4