title: Tell what version of zlib python was built with
body: <p>How can I tell what version of the C library python's zlib module was built with?</p>
  
  <p>Specifically, I want to tell whether it was a new enough version to support ZLIB_RSYNC=1</p>
  
  <p>This is different than the version of the zlib python <em>module</em>, but instead the version of the underlying C library</p>