New license request: gpl-2.0-plus variant

[armijnhemel]

License Name

A variant for GPL-2.0-plus found in squashfs-tools at:

https://github.com/plougher/squashfs-tools/blob/master/squashfs-tools/xz_wrapper_extended.c#L5

Scancode currently gives a partial match to:

https://github.com/aboutcode-org/scancode-toolkit/blob/develop/src/licensedcode/data/rules/gpl-2.0-plus_239.RULE

      "license_detections": [
        {
          "license_expression": "gpl-2.0-plus",
          "license_expression_spdx": "GPL-2.0-or-later",
          "matches": [
            {
              "license_expression": "gpl-2.0-plus",
              "license_expression_spdx": "GPL-2.0-or-later",
              "from_file": "squashfs-tools/squashfs-tools/xz_wrapper_extended.c",
              "start_line": 5,
              "end_line": 17,
              "matcher": "3-seq",
              "score": 96.46,
              "matched_length": 109,
              "match_coverage": 96.46,
              "rule_relevance": 100,
              "rule_identifier": "gpl-2.0-plus_239.RULE",
              "rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/gpl-2.0-plus_239.RULE"
            }
          ],
          "identifier": "gpl_2_0_plus-1cc87c17-6c55-e17e-bfe8-af56fd47cf42"
        }

This is the wrong rule, because the rule explicitly mentions a referenced file name, while the file I am scanning from squashfs-tools does not reference this file name.

This is fixed by #4947