GUACAMOLE-1298: Trim down NOTICE files to only those attribution notices that are required.

From https://infra.apache.org/licensing-howto.html#bundle-asf-product:

>
> Modifications to NOTICE
> -----------------------
>
> The NOTICE file is reserved for a certain subset of legally required
> notifications which are not satisfied by either the text of LICENSE or
> the presence of licensing information embedded within the bundled
> dependency. Aside from Apache-licensed dependencies which supply NOTICE
> files of their own, it is uncommon for a dependency to require additions
> to NOTICE.
>
> Copyright notifications which have been relocated, rather than
> removed, from source files must be preserved in NOTICE. However,
> elements such as the copyright notifications embedded within BSD and MIT
> licenses do not need to be duplicated in NOTICE. You can leave those
> notices in their original locations.
>
> It is important to keep NOTICE as brief and simple as possible, as each
> addition places a burden on downstream consumers.
>
> *Do not* add anything to NOTICE which is not legally required.
>

doc/licenses/jaxb-fi-1.2.16/NOTICE

@@ -9,17 +9,3 @@ project.
 
 Eclipse Implementation of JAXB is a trademark of the Eclipse Foundation.
 
-## Copyright
-
-All content is the property of the respective authors or their employers. For
-more information regarding authorship of content, please consult the listed
-source code repository logs.
-
-## Cryptography
-
-Content may contain encryption software. The country in which you are currently
-may have restrictions on the import, possession, and use, and/or re-export to
-another country, of encryption software. BEFORE using any encryption software,
-please check the country's laws, regulations and policies concerning the import,
-possession, or use, and re-export of encryption software, to see if this is
-permitted.