* Fix handling of negative expiration values, which are somehow allowed by legacy.
See also [gh #125](https://github.com/awesomized/libmemcached/issues/125),
and [gh #76](https://github.com/awesomized/libmemcached/issues/76).
* Fix [gh #122](https://github.com/awesomized/libmemcached/issues/122):
If libcrypto implementation of AES is used, do not compile internal.
* Fix missing include of <array> in tests.
* Fix warnings with non-SASL builds.
* Fix pthread.h detection.