zeromq/libzmq — pull request #691 by minrk (2013-09-29 20:10:19+00:00)
Title: Expose zmq_curve_keypair via zmq_utils

so it will be available to bindings.
Sets ENOTSUP if libsodium is absent.

It is just a z85 wrapper around crypto_box_keypair.

I also removed two asserts from z85 API functions,
which woudl cause crashes on bad input,
when they should just set EINVAL.