Fix finding the Java ATK wrapper, see #900912

--- a/src/hotspot/os/linux/os_linux.cpp
+++ b/src/hotspot/os/linux/os_linux.cpp
@@ -481,6 +481,7 @@ void os::init_system_properties_values()
     }
     Arguments::set_java_home(buf);
     set_boot_path('/', ':');
+    Arguments::append_sysclasspath("/usr/share/java/java-atk-wrapper.jar");
   }
 
   // Where to look for native libraries.