Win will use another completely different approach. So, change the
guards to EFL_HAVE_POSIX_THREADS.
Also, include eina_sched.h as should have been done.
SVN revision: 52654
This function is useful for libraries like ecore and evas that have to
set some worker threads. The first thing these threads should do is to
call this function, so the main thread might continue running without
the worker threads interrupting it too much.
SVN revision: 52651