Resolve clash between 4947890 and 8130264

JDK 4947890 has changed the way that system properties
are initialised from native in the launcher.
Concurrently 8130264 has removed one of those system
properties: java.awt.printerjob

4947890 seems to depend on the property being there
and probably should do nothing if it is not, but right now
we have a situation where you can get (or will) get an NPE
on start up.
Need to fix this ASAP before it escapes from jdk/client