(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.
I'm not sure the benefit. I mean, I know it's great to limit what we're pulling on as runtime dependencies, but at the same time, it looks like we'll only have that ability for el7, and no other rpm platforms...