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

src/osx/carbon/graphics.cpp

@@ -78,10 +78,6 @@ extern void wxOSXUnlockFocus( WXWidget view) ;
 #endif
 #endif
 
-#if 1 // MAC_OS_X_VERSION_MIN_REQUIRED < MAC_OS_X_VERSION_10_5
-
-// TODO test whether this private API also works under 10.3
-
 // copying values from NSCompositingModes (see also webkit and cairo sources)
 
 typedef enum CGCompositeOperation {
@@ -106,8 +102,6 @@ extern "C"
    CG_EXTERN void CGContextSetCompositeOperation (CGContextRef context, int operation);
 } ;
 
-#endif
-
 //-----------------------------------------------------------------------------
 // constants
 //-----------------------------------------------------------------------------