community/libthreadar: upgrade to 1.4.0
From release 1.3.0 to 1.4.0
- added method get_waiting_count() to barrier class
- added alternative implementation for class barrier relying on pthread_cond_t when pthread_barrier_t is not available (Mac OS)
- added static method to class barrier to return the implementation used
Source: https://sourceforge.net/p/libthreadar/code/ci/v1.4.0/tree/build/ChangeLog