build: sasl build fix on FreeBSD
build: sasl build fix on FreeBSD

on some systems (e.g. FreeBSD), shared libraries do not contain symbols
thus build failing for wrong reasons.
here just trying to compile dumb code to check it instead.

dormando/memcached,memcached/memcached,dormando/memcached,memcached/memcached,memcached/memcached,dormando/memcached,dormando/memcached,memcached/memcached,dormando/memcached,memcached/memcached