modules for repositories

[Johan Vos]

When we create modules that are expected to be uploaded to e.g. maven
central or bintray, we have to create jar's with native libs. That is
technically possible (see
http://mail.openjdk.java.net/pipermail/openjfx-dev/2018-May/021887.html)
but before I can finalise PR #83 (
https://github.com/javafxports/openjdk-jfx/pull/83) we need to decide where
the build results should reside.

Currently, build/sdk/lib contains the jars. The current PR will modify
those jars so that they contain the native libraries, but that is wrong as
we don't want the native libs in the jars in the standalone SDK.

What would be the appropriate path for those new jars?

build/repository
build/publish
build/uploads
build/artifacts
?

- Johan