CZMQ uses outdated option to rebuild LIBCURL

[stephan57160]

When we have a look to project.xml:

    <use project = "libcurl" optional = "1" implied = "1" min_major = "7" min_minor = "28">
      <add_config_opts>--with-secure-transport</add_config_opts> 
    </use>

but option --with-secure-transport is no longer supported.
It is not replaced by a bunch of different possibilities:

• --with-gnutls=xxx
• --with-openssl=xxx
• ...

with xxx are path to the given library (I did not try yet, so I'm unsure what path to provide).

Anyway, on my side, I fixed this with 2 options:

• --without-ssl
• --without-libpsl
  to disable any further dependency, but I'm not sure this could be the best way.