Exempt MacOS with LibreSSL to run STARTTLS via LDAP

t/21_baseline_starttls.t

@@ -122,6 +122,8 @@ $socket_out =~ s/ error querying OCSP responder .*\n//g;
 unlike($socket_out, qr/$socket_regex_bl/, "");
 $tests++;
 
+# /usr/bin/openssl on MacOS doesn't seem to be availabe (anymore)
+if ( $os ne "darwin" ){
      #7
      # https://ldapwiki.com/wiki/Public%20LDAP%20Servers
      $uri="db.debian.org:389";
@@ -130,6 +132,7 @@ $socket_out = `$prg $check2run -t ldap $uri 2>&1`;
      # $socket_json = json('tmp.json');
      unlike($socket_out, qr/$socket_regex_bl/, "");
      $tests++;
+}
 
 # For NNTP there doesn't seem to be reliable host out there
 #$uri="144.76.182.167:119";