Introduce generic "MIT (SEI)" license

### Description

Because I cannot reopen issue I am turning my comment in #3536 into a separate issue. @pombredanne

Currently the license at https://github.com/CERTCC/labyrinth/blob/main/LICENSE is recognized as the "vince license", but it is not the "vince license". The licenses of VINCE and Labyrinth Repository Search are instances of a generic MIT license with some CMU specific parts, namely the funding acknowledgements.

The license texts only differ in a few places mostly related to:

* package name
* location of the README
* funding program

For the rest they are nearly identical.

The license was already added as a generic MIT (with some unknown things) at https://github.com/nexB/scancode-toolkit/blob/develop/src/licensedcode/data/rules/mit_and_unknown-license-reference_3.RULE

Another instance can be found at: https://github.com/CERTCC/Vultron/blob/main/LICENSE.md (slightly different)

There are other variations in the CERTCC Git repositories as well which are worth looking into.