Has the zmq_curve_keypair function been deprecated in version 4.3.5？

[yuhongwei-820]

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Issue description

Has the zmq_curve_keypair function been deprecated in version 4.3.5？Are there any alternative interfaces with the same functionality? When using this function, it didn't generate keys and directly returned -1.

Environment

• libzmq version (commit hash if unreleased): 4.3.5
• OS: linux

Minimal test code / Steps to reproduce the issue

1. pass

What's the actual result? (include assertion message & call stack if applicable)

The ZMQ_HAVE_CURVE was set to 0, which caused the code to directly follow the branch that returns -1.

What's the expected result?

return 0.