OSX 32/64 bits support for JDK7 patch for review

[Henri Gomez]

> I assume the ergonomics are kicking in on a standard 32-bit VM and
> flipping it to server mode. I know on Linux machines it doesn't take
> that big a system to cause JVM to default to server mode; having dual
> cores used to be enough in itself. Not sure what the ergonomics are
> these days.
>
> Perhaps Apple forces 32-bit mode to always be client?

With current patch, -d32 activate server mode, -d32 -client activate
client mode.
Not a big deal, but I'd like to know if it's the expected behaviour :)