license.bbclass: include all licenses in the manifest

license.bbclass: include all licenses in the manifest

When we don't have a generic license file for the license in question, we can
warn, but we should still include it in the manifest, otherwise the manifest
doesn't reflect reality. Failing to include a license listed in the recipe in
the manifest can't be allowed.

(From OE-Core rev: e87232828b761d56f1ce6a27e4009d350d68209c)

Signed-off-by: Christopher Larson <chris_larson@mentor.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>