app-text/xxd: switch to GPL-2 license
According to https://raw.githubusercontent.com/FabioLolix/AUR-artifacts/master/xxd-LICENSE,
(c) 1990-1998 by Juergen Weigert (jnweiger@informatik.uni-erlangen.de)
I hereby grant permission to distribute and use xxd
under X11-MIT or GPL-2.0 (at the user's choice).
Small changes made afterwards by Bram Moolenaar et al.
Distribute freely and credit me,
make money and share with me,
lose money and don't ask me.
I'm not too familiar with Portage license names/aliases, but I MIT-X11
doesn't seem to exist and I know GPL-2 does.