fix: Gentoo ebuild and FindAubio.cmake

[yoda-jm]

Aubio requires CBLAS (for example OpenCBLAS implementation) and not BLAS, this patch should fix the issue.

[yoda-jm]

PTAL, compilation with selft aubio set to NEVER and ALWAYS was tested locally. The issue might be related to the fact that I have both libblas (lapack implementation) and libopenblas (openblas implementation) installed and that it mixes things.

[github-actions[bot]]

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[sonarqubecloud[bot]]

Quality Gate passed

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