Package fdb_c into the Jar files

In order to make deploying our clients easier, we would like to ship a jar file that contains fdb_c. This would help us a lot in order to make setup of our development machines easier.

For that reason I would like to put libfdb_c into the jar file (for each OS). I saw [this comment](https://forums.foundationdb.org/t/using-foundationdb-without-installing-client-libraries/1667/3) in the forum about this. As an alternative I would suggest we provide two jars: one with and one without the C client (the current JAR already loads code dynamically, so I am not quite sure I follow John's argument).