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lisa._kmod: Cache compilation on cc --version

Douglas Raillard requested to merge github/fork/douglas-raillard-arm/_home_pr90363 into main

FIX

Caching of the compilation artifact was keyed on the compiler name so far. This breaks if the user manipulates PATH and swaps different binaries under the same name, e.g. multiple versions of clang all called "clang".

Fix that by calling "cc --version" and caching based on the result. This ensures we will not reuse artifacts created with a different toolchain.

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