Build Octave with Java-support

The Octave package is not compiled with Java support.

During compile, the configuration script checks for the environment variable “JAVA_HOME”, i.e. the environment variable needs to be present prior to the build.
From the Octave Wiki: “If your installation of Octave does not have Java support, it needs to be rebuilt from source.”

This could perhaps be solved by adding openjdk to makedepends and setting the environment variable prior to running configure.

(from redmine: issue id 9898, created on 2019-01-23)