Make CMake build usable for other systems

Fix link errors when using -m32 with MinGW

The CPack NSIS installer was in a state where it would always give a
useless error. I think it was using stuff intended for running cpack
separately from cmake.

Fix warnings with ICC.

Make doc building option dependent on asciidoc being installed
Fix MSVC build requiring cygwin.
Don't use try_run to get the version

fix for LIBZMQ-84: Address already in use (signaler.cpp)

eliminate dead code moved into zmq_utils.cpp

TIME_WAIT state.

win32: fix Event handle leak

Pull upstream OpenPGM 5.2.122 for multi-platform minor fixes.

returns -1 with EAGAIN when mandatory is set and pipe is full

return EHOSTUNREACH at full only when mandatory is set

returns EHOSTUNREACH when a peer is full if ZMQ_ROUTER_MANDATORY is set

fix wrong boolean operator in router_raw test code

Close pipes for inproc sockets on zmq_disconnect

- fixes LIBZMQ-476 and LIBZMQ-475

Simplify test_connect_delay

Simplify the test connect delay test script, removing the threads and
moving to a serialised version. AFAICS this should provide the same
test, but without the race conditions that happened with the previous
test.