Update zmq to 4.3.1

Summary:
From [[bitcoin/bitcoin#15188 | PR15188]]:
```
Addresses https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-6250
```

From [[bitcoin/bitcoin#16927 | 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 [[bitcoin/bitcoin#15188 | PR15188]] and [[bitcoin/bitcoin#16927 | 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

depends/packages/zeromq.mk

@@ -1,8 +1,8 @@
 package=zeromq
-$(package)_version=4.2.5
+$(package)_version=4.3.1
 $(package)_download_path=https://github.com/zeromq/libzmq/releases/download/v$($(package)_version)/
 $(package)_file_name=$(package)-$($(package)_version).tar.gz
-$(package)_sha256_hash=cc9090ba35713d59bb2f7d7965f877036c49c5558ea0c290b0dcc6f2a17e489f
+$(package)_sha256_hash=bcbabe1e2c7d0eec4ed612e10b94b112dd5f06fcefa994a0c79a45d835cd21eb
 $(package)_patches=0001-fix-build-with-older-mingw64.patch 0002-disable-pthread_set_name_np.patch
 
 define $(package)_set_vars

depends/patches/zeromq/0002-disable-pthread_set_name_np.patch

@@ -12,7 +12,7 @@ diff --git a/src/thread.cpp b/src/thread.cpp
 index a1086b0c..9943f354 100644
 --- a/src/thread.cpp
 +++ b/src/thread.cpp
-@@ -307,7 +307,7 @@ void zmq::thread_t::setThreadName (const char *name_)
+@@ -308,7 +308,7 @@ void zmq::thread_t::setThreadName (const char *name_)
   */
      if (!name_)
          return;
@@ -21,9 +21,9 @@ index a1086b0c..9943f354 100644
  #if defined(ZMQ_HAVE_PTHREAD_SETNAME_1)
      int rc = pthread_setname_np (name_);
      if (rc)
-@@ -323,6 +323,8 @@ void zmq::thread_t::setThreadName (const char *name_)
+@@ -324,6 +324,8 @@ void zmq::thread_t::setThreadName (const char *name_)
  #elif defined(ZMQ_HAVE_PTHREAD_SET_NAME)
-     pthread_set_name_np (descriptor, name_);
+     pthread_set_name_np (_descriptor, name_);
  #endif
 +#endif
 +    return;

doc/dependencies.md

@@ -34,5 +34,5 @@ These dependencies are required:
 | univalue |||||   | Utility          | JSON parsing and encoding (bundled version will be used unless --with-system-univalue passed to configure)
 | XCB |  |  |  |  | Yes (Linux only) |  |  |
 | xkbcommon |  |  |  |  | Yes (Linux only) |  |  |
-| ZeroMQ | [4.2.5](https://github.com/zeromq/libzmq/releases) | 4.1.5 | No |  |  | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.1.5)
+| ZeroMQ | [4.3.1](https://github.com/zeromq/libzmq/releases) | 4.1.5 | No |  |  | ZMQ notification | Optional, allows generating ZMQ notifications (requires ZMQ version >= 4.1.5)
 | zlib | [1.2.11](http://zlib.net/) |  |  |  | No |  |  |