[ccan] ccan/opt license from GPL3+ to GPL2+?

[Brad Hards]

On Thu, 20 Feb 2014 07:35:20 PM Rusty Russell wrote:
> Hi all,
> 
>         I was looking at cgminer, who use an old version of ccan/opt
> which I relicensed to GPLv2+ for them.  They have done some windows
> build fixes, so I want to merge it.
> 
> Please ack if you're happy to change the license from GPL3 to GPL2 (or
> later).
Ack.

For my (trivial) change to this, ack to any other license you're happy with.

Brad