RF: Adjust find_cuda_exe - FSL executables are no longer labelled with the CUDA version they were compiled against

Paul McCarthyrequested to merge
mnt/cuda-label into master

find_cud_exe <name> [<fallback>] will now return $FSLDIR/bin/<name> if it exists, and CUDA is available, otherwise will return an empty string, or $FSLDIR/bin/<fallback> if provided and it exists.

Edited by Paul McCarthy

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