FindCUDAToolkit: Robust version checks when CUDA lang is not enabled

Robert Maynardrequested to merge
robertmaynard/cmake:findcudatoolkit_handle_cuda_compiler_without_enabled_lang into master

Previously if you set CMAKE_CUDA_COMPILER but hadn't enabled the CUDA language, FindCUDAToolkit would not correctly compute the version information.

Edited by Brad King

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