FreeSWITCH-FS-6836

Merge pull request #935 in FS/freeswitch from ~SJTHOMASON/freeswitch:bugfix/FS-9449-enable-clock-calibration-and-clock_nanosleep to master

* commit 'c5eb29d74d5ac727eb2a08c1e653e3f7e33aaacf':
  FS-9449: Enable clock calibration and clock_realtime on Solaris