Merge commit 'ae90119c'

* commit 'ae90119c':
  configure: Simplify license incompatibility check

An extra GPLV3 list is added for libsmbclient as having it in both GPL
and VERSION3 lists would cause a duplicate in the final config list.

Also, for consistency, libnpp is treated the same as the other nonfree
component (libfdk_aac and openssl).

Merged-by: Clément Bœsch <u@pkh.me>