libzmq: Tests and Protocol Support for TIPC partially broken

Unless there is something missing in my TIPC setup, it seems that all the TIPC tests are broken and they seem to block/hang indefinitely in the Polling code, based on simple runs of strace. The hang happens on the recv path, whilst the send seems to work fine.

How to reproduce the issue?:

• Running latest Ubuntu kernel or any Linux with TIPC support built-in or has tipc kernel module
• Run modprobe tipc to load the TIPC kernel module
• Clone and build LIBZMQ using Autotools

All the TIPC tests hang on the recv code; send seems to work fine