Add wxCFStringRef::AsStringWithNormalizationFormC() Cocoa overload.

Provide an overload taking NSString and casting it to CFStringRef, just as for
AsStringWithNormalizationFormC().

See #13504.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@72894 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/osx/core/cfstring.cpp

@@ -699,7 +699,12 @@ wxString wxCFStringRef::AsString( NSString* ref, wxFontEncoding encoding )
 {
     return AsString( (CFStringRef) ref, encoding );
 }
-#endif
+
+wxString wxCFStringRef::AsStringWithNormalizationFormC( NSString* ref, wxFontEncoding encoding )
+{
+    return AsStringWithNormalizationFormC( (CFStringRef) ref, encoding );
+}
+#endif // wxOSX_USE_COCOA_OR_IPHONE
 
 
 //