Support Xcode 5.0

pkgs/development/mobile/xcodeenv/xcodewrapper.nix

···
-{stdenv, version ? "4.6"}:
+{stdenv, version ? "5.0"}:
 
 stdenv.mkDerivation {
   name = "xcode-wrapper-"+version;
···
     ln -s /usr/bin/xcodebuild
     ln -s /usr/bin/xcrun
     ln -s /usr/bin/security
+    ln -s /usr/bin/codesign
     ln -s "/Applications/Xcode.app/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/Applications/iPhone Simulator.app/Contents/MacOS/iPhone Simulator"
 
     cd ..