make concurrency kit a module

[Baptiste Daroussin]

On Wed, May 17, 2017 at 06:04:09PM -0700, Adrian Chadd wrote:
> https://reviews.freebsd.org/D10778
> 

Except there are plans to use it elsewhere. Many areas may be improved using it.

Having it as a module would mean some devs might refrain from using it because
there is no waranty for it to be there

Areas like VFS and network stack could have a good benefice from using it.

Out of curiousity what size is saved?

Bapt
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