Delete IKVM.Runtime.JNI.dll in clean target.

ikvm.build

@@ -31,6 +31,7 @@
 	    <fileset>
                 <include name="bin/IKVM.AWT.WinForms.dll" />
                 <include name="bin/IKVM.Runtime.dll" />
+                <include name="bin/IKVM.Runtime.JNI.dll" />
                 <include name="bin/IKVM.GNU.Classpath.dll" />
                 <include name="bin/IKVM.OpenJDK.ClassLibrary.dll" />
                 <include name="bin/ikvm-native.dll" />