implement new ICompilerConfiguration method

ajde/testsrc/org/aspectj/ajde/ui/utils/TestCompilerConfiguration.java

@@ -98,6 +98,10 @@ public class TestCompilerConfiguration implements ICompilerConfiguration {
 		return projectSourceFiles;
 	}
 
+	public List getProjectSourceFilesChanged() {
+		return null;
+	}
+
 	public Map getSourcePathResources() {
 		if (sourcePathResources == null) {
 			sourcePathResources = new HashMap();