libzmq: Fix pkg-config files for static linking

Libzmq uses C++ standard library features, so users of it should link
against that as well when statically linking.

Add it to Libs.private so users using pkg-config automatically gets the
correct linker flags.
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>

Some test fail to build targeting less that Windows Vista

When targeting a version of Windows less than Windows Vista, the
security tests fail to build. Added a check for Windows version
and substituted inet_pton for inet_addr. Fixes libzmq issue #1396.

Add CMake option for perf-tools

This allow disable making perf-tools in Release build type
Signed-off-by: Anton Sergeev <Anton.Sergeev@elecard.ru>

REPLACE CMAKE MSVC VERSION SUFFIX VARIABLE

Replace _zmq_COMPILER with CMAKE_VS_PLATFORM_TOOLSET; so the suffix can
be automagically generated for every MSVC compiler supported by cmake.

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