Complete build options for Pthread API

:thought_balloon: Would you like to add the configuration script “[AX_PTHREAD](https://www.gnu.org/software/autoconf-archive/ax_pthread.html "How to build C programs using POSIX threads")” to [your build specification](https://github.com/intel/QATzip/blob/7c3a08ac1e7715198ea4d435d30426226cf98774/configure.ac#L84-L86 "Update candidate")?