posix-threads.c: Include pthread_np.h on FreeBSD to get pthread_set_name_np prototype
unix-support: hide getebp behind ifdef OPEN_DYLAN_ARCH_X86 to get rid of the unused function warning
Merge pull request #661 from hannesm/runtime-freebsd-fixes

posix-threads.c: Include pthread_np.h on FreeBSD to get pthread_set_name...