Handle complex multi-level license file references

[pombredanne]

See https://github.com/vt-middleware/passay by @dfish3r

It has multiple file references notices

• header notice in code refers to -> LICENSE notice refers to -> LICENSE-apache2 and LICENSE-lgpl full texts

The actual files are:

• https://github.com/vt-middleware/passay/blob/main/LICENSE is

This product is dual licensed under a choice of either the Apache-2.0 or the LGPL-3.0 license.
See LICENSE-apache2 and LICENSE-lgpl for the full text of the licenses.

• https://github.com/vt-middleware/passay/blob/main/LICENSE-apache2 and https://github.com/vt-middleware/passay/blob/main/LICENSE-lgpl are full texts

• https://github.com/vt-middleware/passay/blob/main/src/main/java/org/passay/AbstractDictionaryRule.java#L1C1-L1C58 is

/* See LICENSE for licensing and NOTICE for copyright. */

• https://github.com/vt-middleware/passay/blob/main/NOTICE is just misc. credits

• https://github.com/vt-middleware/passay/blob/main/pom.xml is the ambiguous:

  <licenses>
    <license>
      <name>Apache 2</name>
      <url>https://www.apache.org/licenses/LICENSE-2.0.txt</url>
    </license>
    <license>
      <name>GNU Lesser General Public License</name>
      <url>https://www.gnu.org/licenses/lgpl-3.0.txt</url>
    </license>
  </licenses>