bug#54747: 28.1.50; package.el - Better error message if newer Emacs is required

[Lars Ingebrigtsen]

Rudolf Schlatte <rudi@constantly.at> writes:

> I think I can reproduce this via `package-install-from-buffer', with the
> buffer containing the following (the error message is "Package
> 'emacs-30.1' is unavailable"):

Thank you; with that it was trivial to test and make the improvement.
I've now made it say

This package requires Emacs version 30.1

instead.

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   bloggy blog: http://lars.ingebrigtsen.no