Build can fail if the project is modular #144

Hi all,

If you have an UNO Java modular project in Eclipse building the jar file can fail. And this happens both with Ant and by creating the extension directly.

This comes from the fact that Eclipse in modular mode does not necessarily put dependencies in the build path if this dependency comes from a project present in the workspace (ie: sibling project), while in non-modular mode the absence of dependencies produces errors on imports.