libbsd: Add openssl tool

[Christian Mauderer]

Hello,

I've added a port of the openssl tool together with a test for `openssl
speed` (benchmark) and `openssl req` (generating server certificates).

Unfortunately the openssl tool is quite big so that I can't send the
patches to the mailing list. You can find them on a bin-openssl branch here:

  https://git.rtems.org/christianm/rtems-libbsd.git/log/?h=bin-openssl

The two patches are

  Import:
https://git.rtems.org/christianm/rtems-libbsd.git/commit/?h=bin-openssl&id=0fecf49362778d77da97e19cf9cbb639c64e1735

  Port:
https://git.rtems.org/christianm/rtems-libbsd.git/commit/?h=bin-openssl&id=d1dac7891cd3234c935ce7e4d742b6f87663a5e1

If everything is OK, I'll commit the patches and backport them to the
5-freebsd-12 branch.

Best regards

Christian
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Herr Christian Mauderer
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