Fix categorization of llvm license

https://doc-snapshots.qt.io/qt5-5.14/qtqml-attribution-llvm-adt.html claims that the license is a "UIUC 3-clause "New" or "Revised" License", but links to https://spdx.org/licenses/BSD-3-Clause.html .

The actual name in SPDX for this license is NCSA / University of Illinois/NCSA Open Source License , see https://spdx.org/licenses/NCSA.html