! Bailing out the installation for Alien-FFI-0.25.

You don't have libffi installed, or at east cpanm thinks not. If you install libffi outside of Perl (eg. via your OS package manager) then there's no need for Alien::FFI and therefore no need for Net::SSLeay.

Alien::FFI is a dynamic dependency - it is only attempted to be installed itself on systems which don't already have libffi. This is why it doesn't show up in the static dependency lists. HTH.