Mac OS X Lion support

[Douglas Creager]

> The fix from bug 694896 relies on a few others. I'm not sure if you've
> taken them into account, but
> I don't think so from looking at the commit. In particular, as Justin
> syas, it seems that you're not dynamically choosing the correct
> implementation for the version of OSX your program runs on.
> 
> You should check out recent commits to the mozilla codebase, going
> back to revision 2b2f584dc5fd. See
> http://hg.mozilla.org/mozilla-central/log/e6893e6c883f/memory/jemalloc/jemalloc.c.

Okay, I'll take a look at those.

–doug