CUDA: Visual Studio integration bugs prior to 8.0.61

When building shared libraries using Visual Studio the CUDA msbuild section are missing the <target_name>_EXPORTS define.

This looks to be caused by cmVisualStudio10TargetGenerator not storing ``target->GetExportMacro()` as a define for the CUDA language.

Discussed on mailing list:

Edited Jun 20, 2017 by Brad King

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