This one ended up to be a release with lots of small corrections and
improvements without big uncomfortably exciting features. The recent
security fix that went to 2.2.1 and older maintenance tracks is also
contained in this update.
Updates since v2.2
* Recent gcc toolchain on Cygwin started throwing compilation warning,
which has been squelched.
* A few updates to build on platforms that lack tv_nsec,
clock_gettime, CLOCK_MONOTONIC and HMAC_CTX_cleanup (e.g. older
RHEL) have been added.