fix compiler error, need to specify base class access

mailnews/news/src/nsNNTPArticleList.cpp

@@ -26,7 +26,7 @@
 
 typedef PRUint32 nsMsgKey;
 
-class nsNNTPArticleList : nsINNTPArticleList
+class nsNNTPArticleList : public nsINNTPArticleList
 #ifdef HAVE_CHANGELISTENER
  : public ChangeListener
 #endif

mailnews/news/src/nsNNTPNewsgroupPost.cpp

@@ -57,7 +57,7 @@
 #define HEADER_LAST             HEADER_MESSAGEID
 
 
-class nsNNTPNewsgroupPost : nsINNTPNewsgroupPost {
+class nsNNTPNewsgroupPost : public nsINNTPNewsgroupPost {
     
 public:
     nsNNTPNewsgroupPost();