fix a bit of gcc4 build

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@22578 a95241bf-73f2-0310-859d-f6bbb57e9c96

headers/os/app/Roster.h

@@ -13,6 +13,7 @@
 #include <Messenger.h>
 #include <OS.h>
 
+class BFile;
 class BMimeType;
 class BNodeInfo;
 

headers/os/mail/MailAttachment.h

@@ -11,6 +11,8 @@
 #include <MailContainer.h>
 #include <MailComponent.h>
 
+class BFile;
+
 class BMailAttachment : public BMailComponent {
 	public:
 		virtual void SetFileName(const char *name) = 0;

headers/os/media/MediaNode.h

@@ -20,6 +20,7 @@
 #include <new>
 
 class BBufferConsumer;
+class BBufferProducer;
 class BControllable;
 class BFileInterface;
 class BMediaAddOn;

headers/os/media/Sound.h

@@ -8,6 +8,7 @@
 
 class BMediaFile;
 class BSoundFile;
+class BSoundPlayer;
 struct entry_ref;
 
 namespace BPrivate {

headers/os/storage/Directory.h

@@ -10,6 +10,7 @@
 #include <EntryList.h>
 #include <StorageDefs.h>
 
+class BFile;
 class BSymLink;
 
 

headers/os/storage/File.h

@@ -10,6 +10,9 @@
 #include <Node.h>
 
 
+class BEntry;
+
+
 class BFile : public BNode, public BPositionIO {
 	public:
 		BFile();

headers/os/storage/Node.h

@@ -9,6 +9,7 @@
 #include <Statable.h>
 
 class BDirectory;
+class BEntry;
 class BString;
 struct entry_ref;
 

src/kits/tracker/FindPanel.h

@@ -54,6 +54,7 @@ class BTextControl;
 class BCheckBox;
 class BMenuField;
 class BFile;
+class BPopUpMenu;
 
 namespace BPrivate {
 

src/kits/tracker/InfoWindow.h

@@ -44,6 +44,7 @@ All rights reserved.
 #include "Utilities.h"
 
 
+class BFilePanel;
 class BMenuField;
 
 namespace BPrivate {