Debugger: Fix handling of pointer fields in messages.

BMessageValueNode:
- When resolving a pointer field, look up the type by the  fully qualified
  name, as that's how it winds up being stored in the lookup map. Also,
  due to gcc omitting the unspecified parent type on such pointers entirely,
  looking them up by base type name this way won't work anyhow.

src/apps/debugger/value/value_nodes/BMessageValueNode.cpp

@@ -504,9 +504,8 @@ BMessageValueNode::_GetTypeForTypeCode(TeamTypeInformation* info,
 
 		case B_POINTER_TYPE:
 		default:
-			typeName = "";
+			typeName = "void*";
 			constraints.SetTypeKind(TYPE_ADDRESS);
-			constraints.SetBaseTypeName("void");
 			break;
 	}