Depreciate and remove gbde

[Julian H. Stacey]

Hi, Reference:
> From:		John-Mark Gurney <jmg at funkthat.com>
> Date:		Mon, 19 Oct 2015 13:50:08 -0700

John-Mark Gurney wrote:
> So, one thing that the docs talk about is that geli uses the crypto(9)

Interesting.
https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/disks-encrypting.html
Could benefit from a link to John-Mark Gurney's 
http://lists.freebsd.org/pipermail/freebsd-current/2015-October/057855.html

Cheers,
Julian
--
Julian Stacey,  BSD Linux Unix Sys. Eng. Consultant Munich http://berklix.com
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