Get rid of compile- and run-time checks for OS X < 10.5.

As 10.5 is the minimal supported version, it doesn't make sense to check for
it (or even earlier versions) during the build or run-time.

Closes #15580.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@75028 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

include/wx/osx/carbon/private.h

@@ -13,11 +13,6 @@
 #ifndef _WX_PRIVATE_H_
 #define _WX_PRIVATE_H_
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_5
-typedef UInt32 URefCon;
-typedef SInt32 SRefCon;
-#endif
-
 #if wxUSE_GUI
 
 #include "wx/osx/uma.h"
@@ -29,10 +24,6 @@ typedef SInt32 SRefCon;
 
 // app.h
 
-#if MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
-bool wxMacConvertEventToRecord( EventRef event , EventRecord *rec);
-#endif
-
 #endif // wxUSE_GUI
 
 // filefn.h
@@ -269,12 +260,6 @@ ControlActionUPP GetwxMacLiveScrollbarActionProc();
 
 // additional optional event defines
 
-#if MAC_OS_X_VERSION_MAX_ALLOWED < MAC_OS_X_VERSION_10_5
-enum {
-    kEventControlFocusPartChanged = 164
-};
-#endif
-
 class WXDLLIMPEXP_CORE wxMacControl : public wxWidgetImpl
 {
 public :