New license request: GPL variant (rule)

**License Name**

gpl-1.0-plus

**License Homepage URL**

This file at line 811:

https://github.com/mirror/busybox/blob/master/archival/gzip.c#L811

**License Notes**

Currently scancode gives a partial match:

```
"license_expression": "gpl-1.0-plus",
"license_expression_spdx": "GPL-1.0-or-later",
"matches": [
{
"license_expression": "gpl-1.0-plus",
"license_expression_spdx": "GPL-1.0-or-later",
"from_file": "busybox-1.34.1/archival/gzip.c",
"start_line": 811,
"end_line": 812,
"matcher": "3-seq",
"score": 78.57,
"matched_length": 22,
"match_coverage": 78.57,
"rule_relevance": 100,
"rule_identifier": "gpl-1.0-plus_25.RULE",
"rule_url": "https://github.com/nexB/scancode-toolkit/tree/develop/src/licensedcode/data/rules/gpl-1.0-plus_25.RULE"
}

```