Allow for legal snippets to Qt3D.
Allow for legal snippets to Qt3D.

Qt3D has to attribute licenses for stuff it uses, so allow for legal
snippets as well.

Task-number: QTBUG-25160
Change-Id: Ic15ef175480d6e272d4ffed603fbe9fcbecfaeb9
Reviewed-by: Sergey Dubitskiy <4389d85a9c2d7ac0dbf2dcce4529d6c027dcb018@nokia.com>

kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc,kobolabs/qtdoc