cc-wrapper: relocate proprietary-compiler-specific material

PR #275947, which was self-merged without approvals, inserted
functionality specific to a propriteary closed-source compiler
(CUDA) into cc-wrapper.

This commit relocates this CUDA-specific functionality into the
appropritate place: `cuda-modules`.

It is unclear to me exactly what this function is supposed to be
doing; much of it (like the `.kind` attributes) do not appear to be
used *anywhere* in nixpkgs.  Making sure we don't insert unexplained
deadcode like this is one of the important functions of the review
process.

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