Stop using wxBU_AUTODRAW in wxWidgets code

This style bit is obsolete and doesn't do anything, so remove confusing
references to it.

interface/wx/anybutton.h

@@ -13,7 +13,7 @@
 
 #define wxBU_EXACTFIT        0x0001
 #define wxBU_NOTEXT          0x0002
-#define wxBU_AUTODRAW        0x0004
+#define wxBU_AUTODRAW        0x0004 ///< Obsolete, has no effect.
 
 
 /**

interface/wx/bmpbuttn.h

@@ -83,7 +83,7 @@ public:
                    const wxBitmap& bitmap,
                    const wxPoint& pos = wxDefaultPosition,
                    const wxSize& size = wxDefaultSize,
-                   long style = wxBU_AUTODRAW,
+                   long style = 0,
                    const wxValidator& validator = wxDefaultValidator,
                    const wxString& name = wxButtonNameStr);
 
@@ -95,7 +95,7 @@ public:
                 const wxBitmap& bitmap,
                 const wxPoint& pos = wxDefaultPosition,
                 const wxSize& size = wxDefaultSize,
-                long style = wxBU_AUTODRAW,
+                long style = 0,
                 const wxValidator& validator = wxDefaultValidator,
                 const wxString& name = wxButtonNameStr);
 

interface/wx/cshelp.h

@@ -271,7 +271,7 @@ public:
                         wxWindowID id = wxID_CONTEXT_HELP,
                         const wxPoint& pos = wxDefaultPosition,
                         const wxSize& size = wxDefaultSize,
-                        long style = wxBU_AUTODRAW);
+                        long style = 0);
 };