config: severely tweak make.conf and disable libressl for now
config: severely tweak make.conf and disable libressl for now

Prominent change is that we individually disable certain options and
bring back PERL, since we build it anyway.  As long as it isn't installed
by default it's good.  git will then pull it in and gets more usable,
e.g. `git add -p'.

jamsmartsecurity/tools,OptimEnterprises/tools,opnsense/tools,opnsense/tools