bring NS_InitMsgAppCoreClass back from the dead

mailnews/ui/messenger/public/nsIDOMMsgAppCore.h

@@ -53,5 +53,9 @@ class nsIDOMMsgAppCore : public nsIDOMBaseAppCore {
   static NS_EXPORT_(JSObject *) GetJSObject(JSContext *cx, nsIDOMMsgAppCore *priv);
 #endif
 };
+extern "C" NS_DOM
+NS_InitMsgAppCoreClass(nsIScriptContext *aContext, void **aPrototype, JSObject * aParentProto);
+ 
+
 
 #endif /* __gen_nsIDOMMsgAppCore_h__ */

mailnews/ui/messenger/public/nsIDOMMsgAppCore.idl

@@ -49,3 +49,11 @@ interface nsIDOMMsgAppCore : nsIDOMBaseAppCore {
     void OpenURL(in string str);
 };
 
+/* hack to make MsgAppCore visible from AppCore */
+%{ C++
+
+
+extern "C" NS_DOM
+NS_InitMsgAppCoreClass(nsIScriptContext *aContext, void **aPrototype, JSObject * aParentProto);
+ 
+%}