Convert licenses to SPDX

[jn64]

Summary:

• 1000 spec files, containing 1143 License lines
• This PR changes 792 files / 914 lines
  • 705 files / 803 lines were GPLv2+

This PR covers all the valid old license strings that could be converted unambiguously using license-fedora2spdx

• [x] Artistic 2.0
• [x] ASL 2.0
• [x] GPLv2
• [x] GPLv2+
• [x] GPLv2+ and GPLv3
• [x] GPLv2+ and GPLv3+
• [x] GPLv2+ and GPLv3 and Green OpenMusic
• [x] GPLv2+ and ISC
• [x] GPLv3
• [x] GPLv3+
• [x] GPLV3+
• [x] GPLv3+ and LGPLv3+
• [x] ISC
• [x] LGPLv2+ with exceptions and GPLv2+
• [x] Public Domain

References:

• https://docs.fedoraproject.org/en-US/legal/allowed-licenses/
• https://fedoraproject.org/wiki/Changes/SPDX_Licenses_Phase_1#How_To_Test

[jn64]

This turned out to be harder than expected, because there are quite a lot of incorrect/ambiguous licenses which need to be checked individually. Doesn't help that many upstreams are unclear, don't have LICENSE/COPYING file, or have contradictions in their files.

I would rather do this properly and not rush it. So, my plan is:

• Stop checking for now, and just convert whatever can be converted (about 90% of spec files). I will finish up this PR next weekend.
• Short term, check the remaining 10% and write the correct licenses.
• Long term, check the first 90% to make sure the licenses are correct. I suspect a lot of GPLv2+ (GPL-2.0-or-later after conversion) are wrong.

[ycollet]

75% is already a huge step forword. Maybe you can push it now and then from time to time, fix the remaining versions.

[jn64]

Ok, I cut down this PR to the first part only. Should be ok to merge