Ticket 50459 - c_mutex to use pthread_mutex to allow ns sharing
Bug Description: To allow nunc-stans to share the same lock as c_mutex
we need to change conn to use a pthread_mutex instead.
Fix Description: Change c_mutex to pthread
https://pagure.io/389-ds-base/issue/50459
Author: William Brown <william@blackhats.net.au>
Review by: tbordaz, mreynolds (Thank you!)