[cmake-developers] Spurious warning with FindCUDA.cmake on Windows

[Sorley, Stephen L.]

Found a minor problem with FindCUDA.cmake on the master branch.  When using FindCUDA.cmake on Windows with CUDA SDK version 6.5 or older, CMake prints the following warning:

CMake Warning at cmake/FindCUDA.cmake:826 (message):
  Expecting to find librt for libcudart_static, but didn't find it.
Call Stack (most recent call first):
 cmake/build_setup.cmake:693 (find_package)
  CMakeLists.txt:42 (include)

This warning is incorrect, since librt is only present on Linux.  I've attached a patch (based on master) that fixes the problem.

Thanks!
Stephen S.
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