Merge #13689: depends: disable Werror when building zmq

a4ba2388fe depends: disable Werror for zmqlib release, causes ndk build to break (Lawrence Nahum)

Pull request description:

  This PR ~~backports this libzmq commit https://github.com/zeromq/libzmq/pull/3140/commits/58d13395ece1fa0dd9b0583d736af4ac342c1267 from this merged upstream PR (but unreleased as of today) https://github.com/zeromq/libzmq/pull/3140 as a patch to our zmq 4.2.3 version.~~ passes --disable-Werror when we build zmq.

  For reference see https://github.com/bitcoin/bitcoin/issues/11844#issuecomment-398406988

  ~~This patch~~ A similar patch is already in use in abcore/bitcoin_ndk and needed to build bitcoind for android using NDK or some versions of clang 6+ during cross compilation.

  This patch won't be necessary once zmqlib releases a 4.2.6+ version including the fix and bitcoin core updates to it but it may be good to [have](https://github.com/bitcoin/bitcoin/pull/13689#issuecomment-405644394)

  ~~It also reintroduces autogen.sh as it is necessary for the patch to work, otherwise you'll have aclocal issues (see https://travis-ci.org/greenaddress/bitcoin/jobs/404902106). autogen,sh was removed in master only https://github.com/bitcoin/bitcoin/pull/11986 as non-necessary but otherwise unreleased.~~

  In the likely case https://github.com/bitcoin/bitcoin/pull/13578 is merged first I rebased the patch for the newer zmq version (4.2.5) in https://github.com/greenaddress/bitcoin/tree/zmq-upgrade-mruddy-patched and i can update the PR accordingly or close and open a new one.

Tree-SHA512: ba8780c84b4ac4ead5605c0305827431a85c1c8503b7ed255a552469b22bdb4ca018449282f738794f573f93caed95c14ede7caadb3a3f14989f57cb74501f00

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