There's a merged pull request on the void-packages repository

OCaml 4.14
https://github.com/void-linux/void-packages/pull/36683

Description:
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#### Testing the changes
- I tested the changes in this PR: **briefly**

TBD:
- [x] zeroinstall: opam doesn't work with 4.14 yet?
- [x] xen: FTBFS due to as86 missing, unrelated?