Remove duplicate entries from modeshape-client.jar/META-INF

Duplicate entries should be removed to fix JBDS build exception:

[pack200] java.util.zip.ZipException: duplicate entry: META-INF/LICENSE.txt
[pack200] at java.util.zip.ZipOutputStream.putNextEntry(ZipOutputStream.java:192)
[pack200] at java.util.jar.JarOutputStream.putNextEntry(JarOutputStream.java:109)
[pack200] at org.eclipse.update.internal.jarprocessor.JarProcessor.recreateJar(JarProcessor.java:128)
[pack200] at org.eclipse.update.internal.jarprocessor.JarProcessor.processJar(JarProcessor.java:317)
[pack200] at org.eclipse.update.internal.jarprocessor.JarProcessor.extractEntries(JarProcessor.java:217)
[pack200] at org.eclipse.update.internal.jarprocessor.JarProcessor.processJar(JarProcessor.java:304)
[pack200] at org.eclipse.update.internal.jarprocessor.ZipProcessor.processZip(ZipProcessor.java:138)
[pack200] at org.eclipse.update.internal.jarprocessor.JarProcessorExecutor.runJarProcessor(JarProcessorExecutor.java:31)
[pack200] at org.eclipse.update.internal.provisional.SiteOptimizerApplication.runJarProcessor(SiteOptimizerApplication.java:189)
[pack200] at org.eclipse.update.internal.provisional.SiteOptimizerApplication.run(SiteOptimizerApplication.java:509)
[pack200] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[pack200] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[pack200] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[pack200] at java.lang.reflect.Method.invoke(Method.java:616)
[pack200] at org.eclipse.equinox.internal.app.EclipseAppContainer.callMethodWithException(EclipseAppContainer.java:587)
[pack200] at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:198)
[pack200] at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)
[pack200] at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)
[pack200] at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)
[pack200] at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)
[pack200] at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
[pack200] at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
[pack200] at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
[pack200] at java.lang.reflect.Method.invoke(Method.java:616)
[pack200] at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)
[pack200] at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)
[pack200] at org.eclipse.equinox.launcher.Main.run(Main.java:1407)
[pack200] at org.eclipse.equinox.launcher.Main.main(Main.java:1383)