Bug#904493: Workaround found for the Java version detection bug.

[Wojciech Zabolotny CERN]

I have found in my system an old Java, that reports its version as a
longer string.
If I start geogebra in that way:

$ JAVACMD=/usr/lib/jvm/java-1.9.0-openjdk-amd64/bin/java geogebra
It starts and runs correctly.

-- 
Regards,
Wojtek