Improved building of java bindings
Improved building of java bindings

The change does not require setting manually the JAVA_HOME
environment variable anymore, as the correct java runtime
is selected by cmake now.

DLR-SC/tigl,codingpoets/tigl,codingpoets/tigl,codingpoets/tigl,DLR-SC/tigl,DLR-SC/tigl,codingpoets/tigl,codingpoets/tigl,DLR-SC/tigl,codingpoets/tigl,DLR-SC/tigl,DLR-SC/tigl