OpenSSL compatible ./config wrapper

OpenSSL, for some reason, uses the ./config command to prepare its installation. This script is called directly by at least one application.

I have operated Nginx 1.7.5 linked statically against Libressl-portable on CentOS 6.5, and this is the one issue that currently needs patching out as part of that process.

By adding the thin wrapper included in this PR, libressl-portable becomes truly "drop-in" for this scenario and, I would imagine, many others.