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CUDA: improve regex for CUDA Toolkit root from nvcc verbose output

Robert Maynard requested to merge robertmaynard/cmake:improve_cuda_toolkit_extraction_regex into master

The original regular expression was greedy and would match any environment variable ending with TOP (like DESKTOP). This is an issue on windows where nvcc -v would output all environment variables before the compilers verbose output.

To resolve this issue we use a tighter match algorithm that looks for #$ TOP= instead of TOP=.

Fixes: #22158 (closed)
Backport: release

Edited by Brad King

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