Can't remove remaining wx headers from other headers, comment that

src/effects/EffectRack.h

@@ -20,7 +20,7 @@
 
 #include <wx/defs.h>
 #include <wx/frame.h> // to inherit
-#include <wx/timer.h>
+#include <wx/timer.h> // member variable
 
 #include "EffectManager.h"
 

src/effects/VST/VSTControl.h

@@ -11,7 +11,7 @@
 #ifndef AUDACITY_VSTCONTROL_H
 #define AUDACITY_VSTCONTROL_H
 
-#include <wx/control.h>
+#include <wx/control.h> // to inherit
 
 #include "aeffectx.h"
 

src/effects/VST/VSTControlOSX.h

@@ -15,7 +15,7 @@
 #include <Carbon/Carbon.h>
 #endif
 
-#include <wx/osx/private.h>
+#include <wx/osx/private.h> // to inherit wxWidgetCocoaImpl
 
 #include "VSTControl.h"
 

src/effects/audiounits/AUControl.h

@@ -22,8 +22,8 @@
 #include <Carbon/Carbon.h>
 #endif
 
-#include <wx/osx/private.h>
-#include <wx/control.h>
+#include <wx/osx/private.h> // to inherit wxWidgetCocoaImpl
+#include <wx/control.h> // to inherit
 
 #include <AudioUnit/AudioComponent.h>
 #include <AudioUnit/AudioUnit.h>