Add cross-platform thread routines for tests (#2599)

Source: github.com --- Monday, August 07, 2017
Add cross-platform thread routines for tests (#2599) Moves the current clone-based thread routines to thread_clone.h. Moves the current Windows thread routines into thread.h and adds a pthread-based UNIX parallel implementation. Updates api/detach.c and api/startstop.c to use the new cross-platform routines. Moves the _WIN32_WINNT define for condvar.h from needing to be in each test's code (due to header order limitations) to be auto-magically added from cmake. Updates other tests to include the right header files. ...

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