SPDX 2.3: LicenseRefs should not be case insensitive

According to the spec license expressions case sensitivity section, SPDX license IDs should be treated as case insensitive while LicenseRef's should be considered case sensitive.

Currently, if 2 license refs are found that differ only in case, an error is generated.

This situation should be allowed.

For example:

{
      "licenseId": "LicenseRef-BSD-3-clause-GENERIC",
      "extractedText": "NOASSERTION",
      "name": "BSD-3-clause-GENERIC"
    },
[...]
    {
      "licenseId": "LicenseRef-BSD-3-clause-generic",
      "extractedText": "NOASSERTION",
      "name": "BSD-3-clause-generic"
    },

should be allowed.

The error generated is Analysis exception processing SPDX file: Object URI ...#LicenseRef-BSD-3-clause-generic already exists.

L’issue ne nomme aucun fichier source ni aucun test. Commencez par localiser le code qui signale les URI d’Object en double pour les LicenseRefs, ainsi que les tests d’analyse existants ; reproduisez le cas avec deux refs qui ne diffèrent que par la casse, puis confirmez qu’elles sont toutes deux acceptées, tandis que les identifiants de licence SPDX continuent d’être gérés sans distinction de casse.