New license request: LGPL 3 or later variant

**License Homepage URL**

https://github.com/GNOME/gimp/blob/master/libgimp/gimp-debug.h

**License Notes**

Currently not completely recognized:

```
{
"license_expression": "lgpl-3.0-plus",
"license_expression_spdx": "LGPL-3.0-or-later",
"matches": [
{
"license_expression": "lgpl-3.0-plus",
"license_expression_spdx": "LGPL-3.0-or-later",
"from_file": "gimp-debug.h",
"start_line": 6,
"end_line": 18,
"matcher": "3-seq",
"score": 97.2,
"matched_length": 104,
"match_coverage": 97.2,
"rule_relevance": 100,
"rule_identifier": "lgpl-3.0-plus_211.RULE",
"rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/lgpl-3.0-plus_211.RULE"
}
],
"identifier": "lgpl_3_0_plus-020b41c7-0c29-7693-292b-49609337aee1"
}

```