Remove wx/{snglinst,object,notebook}.h from *.h

src/AudacityApp.h

@@ -22,7 +22,6 @@
 #include "MemoryX.h"
 #include <wx/app.h> // to inherit
 #include <wx/dir.h>
-#include <wx/snglinst.h>
 #include <wx/timer.h>
 
 #include "widgets/FileHistory.h"
@@ -32,6 +31,7 @@
 #include <wx/debugrpt.h>
 #endif
 
+class wxSingleInstanceChecker;
 class wxSocketEvent;
 class wxSocketServer;
 

src/FileIO.h

@@ -12,7 +12,6 @@
 #define __AUDACITY_FILEIO__
 
 #include "MemoryX.h"
-#include <wx/object.h>
 
 class wxInputStream;
 class wxOutputStream;

src/Tags.h

@@ -36,7 +36,6 @@
 
 #include "MemoryX.h"
 #include <utility>
-#include <wx/notebook.h>
 
 #include "widgets/wxPanelWrapper.h"