(CFACT-149) build for el 6

openssl-libs doesn't exist on el6, so we need to update that. We're also
updating dep reqs to make sure we're pulling in the most recent versions
of dependencies, that have the static pacakge available.

We're also adding in libcurl at build time so that we can enable that
functionality.
Since el6 doesn't have openssl-libs, we could do this just for el7, so, yeah we could.