Provide JNI artifacts through Maven repository

[Sciss]

In order to write NetCDF-4 files, one has to include the C libraries, as they are used with JNI or JNA. If one uses the pure Java library, adding a cross-platform Maven dependency to one's project is straight forward. It would be great if that opportunity also existed with the C libraries. Some other projects such as OpenCV do this by uploading platform specific jars:

http:https://search.maven.org/#search%7Cga%7C1%7Copencv

The build systems can pick up the correct jars from the list (e.g. linux-armhf.jar, linux-x86.jar, linux-x86_64.jar, macosx-x86_64.jar, windows-x86.jar etc.)