Raise ClassLoaderWeavingAdaptor::defineClass visibility to protected

Relates to https://github.com/eclipse-aspectj/ajdt/issues/57 and it a
precondition for refactoring phase 2 of child class
OSGiWeavingAdaptor::defineClass, which can now directly call the super
methods instead of using reflection.

Signed-off-by: Alexander Kriegisch <Alexander@Kriegisch.name>

loadtime/src/main/java/org/aspectj/weaver/loadtime/ClassLoaderWeavingAdaptor.java

@@ -1225,11 +1225,11 @@ public class ClassLoaderWeavingAdaptor extends WeavingAdaptor {
 		}
 	}
 
-	private void defineClass(ClassLoader loader, String name, byte[] bytes) {
+	protected void defineClass(ClassLoader loader, String name, byte[] bytes) {
 		defineClass(loader, name, bytes, null);
 	}
 
-	private void defineClass(ClassLoader loader, String name, byte[] bytes, ProtectionDomain protectionDomain) {
+	protected void defineClass(ClassLoader loader, String name, byte[] bytes, ProtectionDomain protectionDomain) {
 		if (trace.isTraceEnabled())
 			trace.enter("defineClass", this, new Object[] { loader, name, bytes });
 		debug("generating class '" + name + "'");