sci-libs/cuba: new package, add 4.2.2

[APN-Pucky]

PR created by pkgpr.

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[Nowa-Ammerlaan]

Just some stylistic comments, and a missing || die.

[APN-Pucky]

Thanks, I must admit I did not closely inspect before. I just wanted to check if my added --check-boxes to pkgpr works with github. I should have used the also new --draft option.