Solution: add libtestutil.a before libzmq.a in LDADD listings, as the
linker will complain about undefined symbols otherwise

Fixes https://github.com/zeromq/libzmq/issues/3646

Grant by kreuzberger

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Problem: can no longer send user data from XSUB to XPUB

Solution: fix regression introduced by:
https://github.com/zeromq/libzmq/pull/3168

Correctly fall back to user message if the first byte is neither 0 nor
1, and add a simple unit test

Fixes https://github.com/zeromq/libzmq/issues/3656

Grant by skaller

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B7B30120-05AF-4A53-8023-D9C092DE0873@internode.on.net

Add relicense permission

Relicense permission

Add relicense grant

Grant by dmeehan1968

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Grants by paddor and mbarbisan

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Grants by jbreams and DaiyuHurst

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RELICENSE: add relicense agreement from msune

Add RELICENSE document for msune contributions, both for:

* marcdevel at gmail dot com
* marc at voltanet io

* Introduce DRAFT zmq_ctx_set_ext() and zmq_ctx_get_ext() methods. Change
ZMQ_THREAD_NAME_PREFIX to allow for non-numeric thread name prefixes.

* UDP engine aborts on networking-related errors from socket syscalls #2862

Problem: appveyor binary archives do not contain import libraries

Solution: include all *.lib files

* UDP engine aborts on networking-related errors from socket syscalls #2862

* Add relicense statement

Add relicense agreement from Spotify AB

[CMake] Add ENABLE_PRECOMPILED option

You might want to disable this flag when building with Ninja.

no void pointer to store function pointer

RELICENSE: add grant by Daniel Krikun

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Solution: fix syntax and formatting, remove C-ism for defining struct

Re-license Robert G. Jakabosky (Neopallium)

RELICENSE:  Add relicensing grant