Preserve DefaultContextLoadTimeWeaver no-arg ctor

Issue: SPR-8317

Author: cbeams

org.springframework.context/src/main/java/org/springframework/context/weaving/DefaultContextLoadTimeWeaver.java

@@ -61,6 +61,9 @@ public class DefaultContextLoadTimeWeaver implements LoadTimeWeaver, BeanClassLo
 	private LoadTimeWeaver loadTimeWeaver;
 
 
+	public DefaultContextLoadTimeWeaver() {
+	}
+
 	public DefaultContextLoadTimeWeaver(ClassLoader beanClassLoader) {
 		setBeanClassLoader(beanClassLoader);
 	}