remove GNU Classpath and Apache Harmony compatibility code

Rather than try to support mixing Avian's core classes with those of
an external class library -- which necessitates adding a lot of stub
methods which throw UnsupportedOperationExceptions, among other
comprimises -- we're looking to support such external class libraries
in their unmodified forms.  The latter strategy has already proven
successful with OpenJDK's class library.  Thus, this commit removes
the stub methods, etc., which not only cleans up the code but avoids
misleading application developers as to what classes and methods
Avian's built-in class library supports.

classpath/java/lang/reflect/Method.java

@@ -16,9 +16,7 @@ import avian.SystemClassLoader;
 
 import java.lang.annotation.Annotation;
 
-public class Method<T> extends AccessibleObject
-  implements Member, GenericDeclaration
-{
+public class Method<T> extends AccessibleObject implements Member {
   private final VMMethod vmMethod;
   private boolean accessible;
 
@@ -200,28 +198,4 @@ public class Method<T> extends AccessibleObject
   public Annotation[] getDeclaredAnnotations() {
     return getAnnotations();
   }
-
-  public boolean isSynthetic() {
-    throw new UnsupportedOperationException();
-  }
-
-  public Object getDefaultValue() {
-    throw new UnsupportedOperationException();
-  }
-
-  public Type[] getGenericParameterTypes() {
-    throw new UnsupportedOperationException();
-  }
-
-  public Type getGenericReturnType() {
-    throw new UnsupportedOperationException();
-  }
-
-  public Class[] getExceptionTypes() {
-    throw new UnsupportedOperationException();
-  }
-
-  public TypeVariable<Method<T>>[] getTypeParameters() {
-    throw new UnsupportedOperationException();
-  }
 }