java-atk-wrapper accessibility and openjdk9

[Fridrich Strba]

So, this is the third iteration of my patch and it is patching
completely different place. This patch assures that the
java-atk-wrapper.jar is considered in the time when the assistive
technologies are loaded. We add this element to the class path before
the internal class loaders are instantiated.

We are checking whether the file that was specified in the
assistive_technologies.classpath exist in order not to pollute the class
path with inexistent elements. If we decided not to do that, the
assistive_technologies.classpath could be actually a real class path
with several directories/jar files in it. But not sure we want it here.

Now, I am not sure whether I will be officially and publicly stoned if I
propose this upstream. Therefore, I would not mind if someone had a look
and blew me before I ridicule myself even more.

Cheers

Fridrich
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