Log Message:
2014-11-04 Userspace RCU 0.8.6
        * Fix: silence gcc -Wextra warning
        * compiler: use __GNUC__ instead of the undefined __GNUC_MAJOR__
        * Fix: lfstack reversed empty/non-empty return value
        * lfstack: fix: add missing __cds_lfs_init

2014-10-21 Userspace RCU 0.8.5
        * Fix: preserve example files' timestamps when copying
        * rculfhash: remove duplicated code
        * rculfhash: handle pthread_create failures
        * rculfhash: fall back to single-threaded resize on calloc failure
        * x86: drop extra semi-colon in caa_cpu_relax
        * Fix: Use after free in rcu_barrier()
        * Fix: rcu_barrier(): uninitialized futex field
        * call_rcu threads should clear their PAUSED flag when they unpause
        * Fix: bring back dummy rcu_bp_exit symbol