macOS: deprecated sasl API (improve detection of `libsasl2`).
* Fix [gh #132](https://github.com/awesomized/libmemcached/issues/132):
Add build of static library (with `cmake -DBUILD_SHARED_LIBS=OFF`).
macOS: deprecated sasl API (improve detection of `libsasl2`).
* Fix [gh #132](https://github.com/awesomized/libmemcached/issues/132):
Add build of static library (with `cmake -DBUILD_SHARED_LIBS=OFF`).
* Fix [gh #136](https://github.com/awesomized/libmemcached/issues/136):
`libmemcachedutil` is underlinked (link against libmemcached).
* Fix [gh #136](https://github.com/awesomized/libmemcached/issues/136):
`libmemcachedutil` is underlinked (link against libmemcached).