Haxe IE9 Fix

[Hassan Bazzi]

I worked for weeks to make my game work in IE9. I finally figured out that the issue was related to xmlHTTPrequests. After a ton of work, I finally was able to edit the compiled JS file manually and fix it all up. The next step was adding this to the Haxe source files itself, so after some more digging, I also figured that out.

The Stockoverflow ticket I made: http://stackoverflow.com/questions/26218778/haxe-ie9-xmlhttprequest-issue/26219445?iemail=1&noredirect=1#26219445

The pull request on the final fix: https://github.com/HaxeFoundation/haxe/pull/3449

I would love some feedback on the fix and how to make it viable and worthy to be merged to the project.

Thanks,

Hassan