libbsd: Add openssl tool

[Sebastian Huber]

On 27/03/2019 20:40, Chris Johns wrote:
>> I'll commit the patches and backport them to the
>> 5-freebsd-12 branch.
> What is this branch? I could not find anything in the top level CONTRIBUTING.md
> doc. Is it documented?

I added a "Branches" section to the README.md:

https://github.com/RTEMS/rtems-libbsd#branches

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Sebastian Huber, embedded brains GmbH

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