Fix CUDA builds on Windows

[fmassa]

CUDA builds on Windows were failing after #1410 was merged, with errors like

D:/_work/1/s/packaging/windows/vision/torchvision/csrc/cuda/PSROIAlign_cuda.cu(339): error: no instance of function template "at::cuda::ATenCeilDiv" matches the argument list
              argument types are: (int64_t, long)
  
  D:/_work/1/s/packaging/windows/vision/torchvision/csrc/cuda/PSROIAlign_cuda.cu(339): error: no instance of overloaded function "std::min" matches the argument list
              argument types are: (<error-type>, long)
  
  D:/_work/1/s/packaging/windows/vision/torchvision/csrc/cuda/PSROIAlign_cuda.cu(398): error: no instance of function template "at::cuda::ATenCeilDiv" matches the argument list
              argument types are: (int64_t, long)
  
  D:/_work/1/s/packaging/windows/vision/torchvision/csrc/cuda/PSROIAlign_cuda.cu(398): error: no instance of overloaded function "std::min" matches the argument list
              argument types are: (<error-type>, long)

see https://dev.azure.com/pytorch/PyTorch/_build/results?buildId=17560 for the full logs.

This PR fix it following an approach similar to #953

[peterjc123]

Fixes #1484. LGTM

[codecov-io]

Codecov Report

Merging #1485 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #1485   +/-   ##
=======================================
  Coverage   64.46%   64.46%           
=======================================
  Files          83       83           
  Lines        6421     6421           
  Branches      982      982           
=======================================
  Hits         4139     4139           
  Misses       1992     1992           
  Partials      290      290

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