Make license and VCS explicit

[asarhaddon]

Hello.
Now that the XML files are in their own package, their license status is not crystal-clear anymore out of context. Could you please make explicit that the license is GPL-3+ with GCC-runtime-library exception?

[asarhaddon]

This slight formal ambiguity in the license is currently preventing inclusion of gprconfig-kb in Debian, where most Ada packages depend on gprbuild, and a pre-release freeze is planned for january.

The commit above is only a suggestion inspired by similar AdaCore packages, but a text file explicitly stating which license applies to the XML files would be sufficient. If you expect such a change to take time, please inform us. Another option is to revert gprbuild to a previous version including an explicitly licensed gprconfig_kb, at least for next release.

Thanks.

[Fabien-Chouteau]

@asarhaddon we never had copyright/license headers in the gprconfig xml files, even when they were in the gprbuild repo. They are not required. The gprconfig_kb repo is distributed with a set co COPYING* files which define the license for the files in the repo.

[asarhaddon]

Ok. Thanks for your answer. Your confirmation of my interpretation will probably remove last doubts.