FD_SETSIZE Increase to 1024

FD_SETSIZE Increase to 1024

Sets FD_SETSIZE to 1024 under mingw systems, increasing it from the default of 64, and brings it into line with the previous limit for CMake builds on mingw.

update to current master

Problem: incomplete specs for test_proxy_terminate

Solution: fixed this in Makefile.am

Fix for issue #1382

Solution: Build libsodium from latest master branch. Fixes 1386.

Release memory on connection termination for pub, push sockets

change minimum version to windows vista 

Problem: integer narrowing issues.

Allow configure to support mingw64

allow host_os to accept mingw64

Problem: issue #1144, 1377

This is a silly assertion that causes problems if libzmq.dll is
called in some esoteric ways.

Solution: if the shutdown code detects WSANOTINITIALISED, then
exit silently.

Fixes #1377
Fixes #1144

Solution: add settle pause after zmq_connect

Fixes #1340

Add Bitrig to OS detection in configure.ac.

Changes the pattern for the host_os matches to *mingw* from *mingw32* to accept both mingw32 and mingw64 versions.

Fix for issue #1287: ZMQ_XPUB_NODROP documentation

#1287

fix for issue #1287

doc: add ENOENT to list of zmq_unbind error codes

Resolves zeromq/libzmq#1353

update zmq_ctx_term description for consistency

zmq_term and zmq_ctx_destroy are just aliases for zmq_ctx_term. that
being the case use 'terminate' in the description for all three so there
isn't any confusion about behavior.

also update the deprecates list in zmq_ctx_term to include
zmq_ctx_destroy.

doc: zmq_msg_init does not set errno

In fact it always returns zero.

Problem: wrong default VC rt lib for release dynamic exe.

fix CMP0053 warning with cmake 3.1