Suppress two deprecation warnings about an internal CGNode API

The supposedly deprecated function (CGNode.addTarget) really seems to
be intended for internal use, not deprecated per se.  We are an
internal user here, so presumably it's OK for us to be using this API
entry point.

com.ibm.wala.core/src/com/ibm/wala/ipa/callgraph/cha/CHACallGraph.java

@@ -110,6 +110,7 @@ public class CHACallGraph extends BasicCallGraph<CHAContextInterpreter> {
     setInterpreter(new ContextInsensitiveCHAContextInterpreter());
   }
 
+  @SuppressWarnings("deprecation")
   public void init(Iterable<Entrypoint> entrypoints) throws CancelException {
     super.init();
 
@@ -213,6 +214,7 @@ public class CHACallGraph extends BasicCallGraph<CHAContextInterpreter> {
   private int clinitPC = 0;
   
   @Override
+  @SuppressWarnings("deprecation")
   public CGNode findOrCreateNode(IMethod method, Context C) throws CancelException {
     assert C.equals(Everywhere.EVERYWHERE);
     assert !method.isAbstract();