Ripper source code misclassified as lgpl-2.1

### Description

In [this report](http://miroslav.suchy.cz/fedora/spdx-reports/ruby.html) generated by ScanCode version 32.0.8 for Fedora packages, the Ripper, which is included in Ruby package is misclassified as lgpl-2.1 at [these lines](https://github.com/ruby/ruby/blob/e51014f9c05aa65cbf203442d37fef7c12390015/ext/ripper/lib/ripper/core.rb#L7-L8):

~~~
# This program is free software.
# You can distribute and/or modify this program under the Ruby License.
~~~

### How To Reproduce

I just toot the report generated by somebody else.

### System configuration

> For bug reports, it really helps us to know:

* What OS are you running on? Fedora
* What version of scancode-toolkit was used to generate the scan file? 32.0.8
* What installation method was used to install/run scancode? Not sure