Update zmq to 4.3.1
Summary:
From PR15188:
Addresses https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6250
From PR16927:
Currently in Alpine Linux (latest, 3.10) in the depends system, one of the ZeroMQ patches won't apply cleanly because the context around the patch has changed and Alpine's patch implementation can't handle the diff. Some patch implementations can't handle fuzz / too much divergence from the original code. This PR just tweaks the context code around the patch so that less-sophisticated patch implementations (such as on Alpine Linux) can apply the patch without errors.
Backport of core PR15188 and PR16927.
Depends on D5603.
Test Plan: Run the Gitian builds.
Reviewers: #bitcoin_abc, deadalnix
Reviewed By: #bitcoin_abc, deadalnix
Differential Revision: https://reviews.bitcoinabc.org/D5607