Remove Cocoa code and precompiler defines targeting OS X versions prior to OS X 10.7.

include/wx/osx/cocoa/private.h

@@ -336,7 +336,7 @@ public:
     - (void) setTextField:(NSTextField*) field;
     @end
 
-    @interface wxNSTextField : NSTextField wxOSX_10_6_AND_LATER(<NSTextFieldDelegate>)
+    @interface wxNSTextField : NSTextField <NSTextFieldDelegate>
     {
         wxNSTextFieldEditor* fieldEditor;
     }
@@ -346,14 +346,14 @@ public:
 
     @end
 
-    @interface wxNSSecureTextField : NSSecureTextField wxOSX_10_6_AND_LATER(<NSTextFieldDelegate>)
+    @interface wxNSSecureTextField : NSSecureTextField <NSTextFieldDelegate>
     {
     }
 
     @end
 
 
-    @interface wxNSTextView : NSTextView wxOSX_10_6_AND_LATER(<NSTextViewDelegate>)
+    @interface wxNSTextView : NSTextView <NSTextViewDelegate>
     {
     }
 
@@ -432,7 +432,7 @@ public:
 #ifdef __LP64__
     WXEXPORT
 #endif // 64 bit builds
-    @interface wxNSAppController : NSObject wxOSX_10_6_AND_LATER(<NSApplicationDelegate>)
+    @interface wxNSAppController : NSObject <NSApplicationDelegate>
     {
     }