PCRE2 is available under BSD-3-Clause, but with a relevant exception
that arguably applies to the way Qt uses it, too. So let's mention
this exception in the listed license.
Unfortunately, the exception is not part of the SPDX database, and
combining a standard license with a custom exception is not supported
yet. See [1] for a related discussion. Meanwhile, just defining a whole
license is a common workaround.
[1] https://github.com/spdx/spdx-spec/issues/153
[ChangeLog][Third-Party Code] Clarifying license of PCRE2 to be
BSD-3-Clause with advertisement exception for binary-like packages.
Pick-to: 6.5
Change-Id: Ib6d46806dc5a00ff2f795054ad9bf0ae62920501
Reviewed-by: Volker Hilsheimer <volker.hilsheimer@qt.io>