Flagged Out-of-Date Comment: libnn-git

MarsSeed flagged libnn-git out-of-date on 2024-03-15 (UTC) for the following reason:

URL broken. Pls add mandatory provides & conflicts for 'libnn'. Add custom nn/LICENSE file and a custom license notice from triangle.c / triangle.h. Declare license=('BSD-2-Clause' 'LicenseRef-Triangle').