Review OSX universal mode patch

[Henri Gomez]

Hi to all

Could someone review my patches to bring back universal mode
(32/64bits) to OSX for OpenJDK 7 (u branch)

http://openjdk-osx-build.googlecode.com/svn/trunk/patches-jdk7u-osx/universal-build.patch

Now os.arch is reported as i386 if data.model is 32 and as x86_64 is
data.model is 64bits.

It should fix problem with JRuby :

https://github.com/jruby/jruby/commit/9e05b5f1791917cdc3487b3ddfd78956c4bb92c0#commitcomment-1306674

Cheers