Clarify that we consume Prolog Cafe under the EPL

The old formulation gave the impression that we may consume Prolog
Cafe under the GPLv3. However, doing so would infect our built WARs
with GPLv3 and we could no longer distribute them under the Apache
License 2.0.

Change-Id: Ie798b78abe49de6cc06cae9bb87c3994323a0dcd
1 file changed