ClearlyDefined uses the string `OTHER` for the declared license when
a human has reviewed `NOASSERTION` text and found it to be a valid
license, but one without an SPDX identifier. `OTHER`, unlike
`NOASSERTION`, is not valid. With this change, when `OTHER` appears
in a license string, we'll replace it with
`LicenseRef-clearlydefined-OTHER`, which _is_ valid and will allow
the expressions to parse.
Kevin Dangoor
82299c3bbe