Remove the `build/msvc` include path from the test project to fix a
problem with the order of the include paths. Additionally remove the
unnecessary `include_directories` from the master project.
Signed-off-by: Stefan Herbrechtsmeier <stefan.herbrechtsmeier@weidmueller.com>

Solution: add it to the list

Solution: add optional lookup for openpgm via pkg-config

Solution: add one to increase coverage

only if the library is found at a specific path

Solution: Search for libzmq.lib in ../bin/Win32/Debug/v120/dynamic, don't
know how to automatically search in correct path based on current build
configuration

Solution:
- Add file for testing ancillary API methods and any misc internal machinery
- Add tests for zmq_version(3) and zmq_strerror(3)
- Add test file into gitignore, Autotools and CMake build files
- Increase test coverage

Note:
MSVC solution files have not been updated.

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: mark them as DRAFT APIs

Solution: add support for --enable-drafts/ENABLE_DRAFTS=ON in
Autools and CMake.

Solution: PR #1906 did not solve this problem properly; subsequent Travis CI
indicated that the issue happens with Clang/LLVM, so make sure to fix the
issue by detecting if Cmake CMake is using Clang for building the tests.

Solution: move it to the unix-only section of Makefile.am and
tests/CMakeLists.txt since it uses Unix IPC sockets.

Solution: add macro in ZMQSourceRunChecks.cmake and optionally
include the TIPC sources if the support is available.
More importantly, only run the TIPC tests if the support is there.

Problem:
A per-test Linker search path was added in commit a911fa41 to CMakeLists.txt as
part of fixing Windows builds. Whilst this is silently ignored by ld(1) on
Linux, it doesn't settle well with OS X. Spurious warnings are generated about
missing directories leading to convoluted build logs.

Solution:
Make per-Test LINK_DIRECTORIES() conditional for non-Apple platforms.

Solution: fix comment

Move tests specific to Linux under a platform conditional thereby eliminating
unnecessary builds and fixing "make test" on Mac OS X and possibly other
non-Linux systems.

Tests specific to Linux:
    - abstract namespace support for AF_UNIX sockets
    - TIPC support (AF_TIPC)

Test success rate jumps from 90% to 100% on Mac OS X after this change.

Solution: remove temporarily until proper message limits have been
implemented, then a more granular test case can be added without
such high requirements which are problematic in embedded environment,
build systems, VMs and CI systems

Solution: Add precompiled flags to CMakeList.txt for faster compiles
+ bonus - removed compilation warning on Windows by adding
	 add_definitions (-D_WINSOCK_DEPRECATED_NO_WARNINGS)

Solution: Modified CMakelist.txt to build correctly for Windows
- corrected CMake required version to make sure it builds in
  Ubuntu 14.04 LTS with no warnings.

Solution: Modified CMakelist.txt to build correctly for Windows

Solution: rename socket option (and variables and files) from usefd
to use_fd.

Solution: rename socket option (and variables and files) from
pre_allocated_fd to usefd.

Solution: parse the value set by the ZMQ_PRE_ALLOCATED_FD sockopt
when creating a new TCP socket and use it if valid.
Add new tests/test_pre_allocated_fd_tcp.cpp unit test.

Solution: parse the value set by the ZMQ_PRE_ALLOCATED_FD sockopt
when creating a new IPC socket and use it if valid.
Add new tests/test_pre_allocated_fd_ipc.cpp unit test.

This commit fixes the author warnings reported below. These tests
have originally been introduced in zeromq/libzmq@5ebfd17 and
zeromq/libzmq@5fe75f0.

8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---
CMake Warning (dev) at tests/CMakeLists.txt:133 (message):
  Test 'test_udp' is not known to CTest.
This warning is for project developers.  Use -Wno-dev to suppress it.

CMake Warning (dev) at tests/CMakeLists.txt:133 (message):
  Test 'test_large_msg' is not known to CTest.
This warning is for project developers.  Use -Wno-dev to suppress it.
8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---8<---

found.
Solution: Include the source directory

Problem: _sleep is a library function of Windows.
Solution: use sleep_

VMCI transport allows fast communication between the Host
and a virtual machine, between virtual machines on the same host,
and within a virtual machine (like IPC).

It requires VMware to be installed on the host and Guest Additions
to be installed on a guest.

Solution: add test case