Fixed build under Dano; doesn't work there, though, but hangs on start in some endless loop.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@21323 a95241bf-73f2-0310-859d-f6bbb57e9c96

src/apps/mediaplayer/playlist/CopyPLItemsCommand.h

@@ -12,6 +12,7 @@
 #include "Command.h"
 
 class Playlist;
+struct entry_ref;
 
 class CopyPLItemsCommand : public Command {
  public:

src/apps/mediaplayer/playlist/ImportPLItemsCommand.h

@@ -13,6 +13,7 @@
 
 class BMessage;
 class Playlist;
+struct entry_ref;
 
 class ImportPLItemsCommand : public Command {
  public:

src/apps/mediaplayer/playlist/MovePLItemsCommand.h

@@ -12,6 +12,7 @@
 #include "Command.h"
 
 class Playlist;
+struct entry_ref;
 
 class MovePLItemsCommand : public Command {
  public:

src/apps/mediaplayer/playlist/Playlist.h

@@ -25,6 +25,8 @@
 #include <List.h>
 #include <Locker.h>
 
+class BMessage;
+
 class Playlist : public BLocker {
 public:
 	class Listener {

src/apps/mediaplayer/playlist/RemovePLItemsCommand.h

@@ -12,6 +12,7 @@
 #include "Command.h"
 
 class Playlist;
+struct entry_ref;
 
 class RemovePLItemsCommand : public Command {
  public: