Non-free package in latexextra collection

[Ulrich Mueller]

The latexextra collection in TeXLive 2019 contains the "axessibility"
package, which says in its header:

%% This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 License
%% http://creativecommons.org/licenses/by-nc/4.0/

That doesn't qualify as free software.

See also downstream bug: https://bugs.gentoo.org/687328