ec-field-test.c: Make the field-element type use internal format.

[secnet] / mdw-test / secnet.conf

### -*-conf-*-

resolver = adns { };
random = randomfile("/dev/urandom");
#transform = serpent256-cbc { };
transform = eax-serpent { };
system = { };

log-events = "all";

netlink = userv-ipif {
        local-address = "1.0.0.0";
        userv-path = "./fake-userv-ipif";
        buffer = sysbuffer();
};