Unify licenses of the project
We at NixOS were packaging, and couldn't figure out the project license.
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https://gitlab.gnome.org/GNOME/at-spi2-atk/blob/master/COPYING says a project is GNU Library General Public License, version 2.0, which is superseded. https://www.gnu.org/licenses/old-licenses/lgpl-2.0.en.html
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https://gitlab.gnome.org/GNOME/at-spi2-atk/blob/master/atk-adaptor/accessible-stateset.c#L11 says it is GNU Library General Public License, version 2.0 of the License, or (at your option) any later version. So it is GNU Library General Public License v 2.0+, so it is also superseded but supports later versions.
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https://gitlab.gnome.org/GNOME/at-spi2-atk/blob/master/meson.build#L3 is GNU Lesser General Public License, version 2.1 of the License, or (at your option) any later version.
At least case №1 does not support later versions of the license.
Thank you.