The quit strategy API existed in com.apple.eawt prior to Java 9, and was moved
into java.desktop in 9. This move makes our orange-extensions API incompatiable
with the 9 eawt package too, so we can not use Application.setQuitStrategy on
9+ either, without making orange-extensions multi-release too.
Since Desktop.setQuitStrategy is the new standard way of doing this, use it if
available, and otherwise use the Java 8 Application.setQuitStrategy instead.
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