In func_group.test, round the results of std() for some calls, because Windows' sqrt() function appears to return fewer "significant" digits than the Unix implementations.
This is for bug #22555.


mysql-test/r/func_group.result:
  Round the results of std() for some calls, because Windows' sqrt() function appears to return fewer "significant" digits than the Unix implementations.
  This is for bug #22555.
mysql-test/t/func_group.test:
  Round the results of std() for some calls, because Windows' sqrt() function appears to return fewer "significant" digits than the Unix implementations.
  This is for bug #22555.