Urgent security update necessary for all DragonFly versions

[Matthew Dillon]

:Done earlier, at least I've updated all my machines already.
:Oh, and thanks for the disclosure, corecode! :-)
:
:-- 
:Gergo Szakal <bastyaelvtars at gmail.com>

    I bumped the preview tag for HEAD, just in case it hadn't been done.
    Probably between the two of us we've synchronized all the slip tags
    multiple times now :-).

    Note that HEAD is going through numerous changes that require world
    rebuilds but, at the moment, it should be fairly stable.

					-Matt
					Matthew Dillon 
					<dillon at backplane.com>