Fails build when using `--with-vmci`

[oliverkurth]

Issue description

Fails build when using --with-vmci

Environment

• libzmq version (commit hash if unreleased): 4.3.4
• OS: Ubuntu 20.04

Minimal test code / Steps to reproduce the issue

1. ./configure --with-vmci && make

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

  CXX      src/libzmq_la-vmci_connecter.lo
src/vmci_connecter.cpp:38:10: fatal error: stream_engine.hpp: No such file or directory
   38 | #include "stream_engine.hpp"
      |          ^~~~~~~~~~~~~~~~~~~
compilation terminated.

What's the expected result?

successful build

[oliverkurth]

I forgot to mention: to reproduce, you also need to get the file https://github.com/vmware/open-vm-tools/blob/master/open-vm-tools/lib/include/vmci_sockets.h and copy it to /usr/include. Otherwise the build will fail sooner.

[bluca]

already fixed in main