Failed to build tests on MinGW-w64 (x86-64)

[2/558] Building CXX object vtkm/cont/testing/CMakeFiles/UnitTests_vtkm_cont_testing.dir/UnitTestTimer.cxx.obj
FAILED: vtkm/cont/testing/CMakeFiles/UnitTests_vtkm_cont_testing.dir/UnitTestTimer.cxx.obj
C:\msys64\mingw64\bin\c++.exe    -IC:/msys64/home/Engineer46/packages/vtk-m/src/vtk-m -Iinclude -march=x86-64 -mtune=generic -O2 -pipe  -O3 -DNDEBUG -fvisibility=hidden -fno-keep-inline-dllexport   -std=c++11 -MD -MT vtkm/cont/testing/CMakeFiles/UnitTests_vtkm_cont_testing.dir/UnitTestTimer.cxx.obj -MF vtkm\cont\testing\CMakeFiles\UnitTests_vtkm_cont_testing.dir\UnitTestTimer.cxx.obj.d -o vtkm/cont/testing/CMakeFiles/UnitTests_vtkm_cont_testing.dir/UnitTestTimer.cxx.obj -c C:\msys64\home\Engineer46\packages\vtk-m\src\vtk-m\vtkm\cont\testing\UnitTestTimer.cxx
C:\msys64\home\Engineer46\packages\vtk-m\src\vtk-m\vtkm\cont\testing\UnitTestTimer.cxx: In function 'void {anonymous}::Time()':
C:\msys64\home\Engineer46\packages\vtk-m\src\vtk-m\vtkm\cont\testing\UnitTestTimer.cxx:35:13: error: 'Sleep' was not declared in this scope
   Sleep(1000);
             ^

from C:\msys64\mingw64\bin\c++.exe -E -dM - + ctrl-Z & Enter

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#define __INT8_TYPE__ signed char
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#define __UINT_FAST8_TYPE__ unsigned char
#define __WIN64__ 1
#define __ATOMIC_ACQ_REL 4
#define __ATOMIC_RELEASE 3
#define __declspec(x) __attribute__((x))      

We may want to change

#ifndef _WIN32
    sleep(1);
#else
    Sleep(1000);
#endif

to

#if !defined(_WIN32) || defined(__MINGW32__)
#include <unistd.h>
#else
#include <windows.h>
#endif

...

#if !defined(_WIN32) || defined(__MINGW32__)
    sleep(1);
#else
    Sleep(1000);
#endif