removing code for pre 10.6 systems

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@77034 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/carbon/graphics.cpp

@@ -1757,11 +1757,7 @@ bool wxMacCoreGraphicsContext::SetInterpolationQuality(wxInterpolationQuality in
             quality = kCGInterpolationLow;
             break;
         case wxINTERPOLATION_GOOD:
-#if wxOSX_USE_COCOA_OR_CARBON
-            quality = UMAGetSystemVersion() < 0x1060 ? kCGInterpolationHigh : (CGInterpolationQuality) 4 /*kCGInterpolationMedium only on 10.6*/;
-#else
             quality = kCGInterpolationMedium;
-#endif
             break;
         case wxINTERPOLATION_BEST:
             quality = kCGInterpolationHigh;