Remove wx/stattext.h from headers

src/prefs/DirectoriesPrefs.h

@@ -11,13 +11,14 @@
 #ifndef __AUDACITY_DIRECTORIES_PREFS__
 #define __AUDACITY_DIRECTORIES_PREFS__
 
-#include <wx/stattext.h>
 #include <wx/textctrl.h>
 
 #include "PrefsPanel.h"
 
 class ShuttleGui;
 
+class wxStaticText;
+
 class DirectoriesPrefs final : public PrefsPanel
 {
  public:

src/prefs/KeyConfigPrefs.cpp

@@ -30,6 +30,7 @@ KeyConfigPrefs and MousePrefs use.
 #include <wx/filedlg.h>
 #include <wx/menu.h>
 #include <wx/button.h>
+#include <wx/stattext.h>
 
 #include "../Prefs.h"
 #include "../Project.h"

src/prefs/LibraryPrefs.cpp

@@ -23,6 +23,7 @@ MP3 and FFmpeg encoding libraries.
 
 #include <wx/defs.h>
 #include <wx/button.h>
+#include <wx/stattext.h>
 
 #include "../FFmpeg.h"
 #include "../ShuttleGui.h"

src/prefs/LibraryPrefs.h

@@ -15,11 +15,11 @@
 
 #include <wx/defs.h>
 
-#include <wx/stattext.h>
 #include <wx/window.h>
 
 #include "PrefsPanel.h"
 
+class wxStaticText;
 class ShuttleGui;
 
 class LibraryPrefs final : public PrefsPanel