Compatibility fix for jdk 1.7 regarding sun.awt.X11GraphicsEnvironment

[duns]

There is a problem in freehep-vectorgraphics
(org.freehep.graphics2d.PixelGraphics2D class) that was recently reported by
dCache people - they ran into it once they switched to jdk1.7.

isDisplayLocal() in the sun.awt.X11GraphicsEnvironment implementation is now
an instance rather than a static method, and thus cannot be called via
reflection with the first parameter of the Method.invoke(.) method being
null. I attach a patch that fixes it.

[duns]

# This patch file was generated by NetBeans IDE
# This patch can be applied using context Tools: Apply Diff Patch action on respective folder.
# It uses platform neutral UTF-8 encoding.
# Above lines and this line are ignored by the patching process.
100,102c100,105
<             Method method = clazz.getMethod("isDisplayLocal", null);
<             Boolean result = (Boolean) method.invoke(null, null);
<             displayLocal = result.booleanValue();
---
>             Method method = clazz.getMethod("isDisplayLocal");
>             try {
>               displayLocal = (Boolean) method.invoke(clazz.newInstance()); // since JDK 1.7
>             } catch (InstantiationException x) {
>               displayLocal = (Boolean) method.invoke(null);
>             }