Allow to upgrade to a hidden-version package if a hidden-version package is already installed #4525
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Currently if for instance
ocaml-base-compiler.4.12.0~beta1
(flagged withhidden-version) is installed, calling
opam upgrade` results in:With this patch it should be upgraded to
ocaml-base-compiler.4.12.0~beta2
in this case.cc @dra27 @AltGr