The problem was because the gettimeofday function was incorrect
implemented for Windows, and so the semisync master did not wait
for slave reply properly on Windows.

Fixed by removing the gettimeofday function for Windows, and using
set_timespec function to get current time for all platforms.


plugin/semisync/semisync_master.cc:
  removing the gettimeofday function for Windows, using set_timespec
  function to get current time for all platforms.