Fix broken Xcode 5.1 w/patch in script/boxen

[seanknox]

Now that clang/LLVM shipped in Xcode 5.1 errors when running Boxen the first time, one suggestion was to patch system Ruby to use the same behavior in Xcode <= 5.0.

Would it be worthwhile to add something like this in script/boxen?

# Fix for system ruby with Xcode 5.1
if [[ $CLT_VERSION =~ ^5\.1 ]]; then
  echo "--> Fixing system Ruby that ships with Xcode 5.1."

  curl --progress-bar https://gist.githubusercontent.com/seanknox/10688629/raw/1e57fbb440d36ca5607d1739cc6151f373b234b6/gistfile1.txt | sudo patch /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/universal-darwin13/rbconfig.rb
fi

[rafaelfranca]

I don't think we should patch system Ruby. I think we can just pass ARGSFLAG on script/boostrap

[seanknox]

You're right, patching is overzealous. Are you saying that setting ARCHFLAGS in https://github.com/boxen/our-boxen's script/bootstrap might do the trick?

[rafaelfranca]

I think so.

[seanknox]

Fixed in #52.