[Cbc] muti-thread compile for cbc-2.7.8

[Noli Sicad]

> I just built Cbc 2.7.8 in OSX 10.8 with --enable-cbc-parallel and executed
> with "-threads 4" and it works fine. You'll have to give some more details,
> such as what compiler(s) you're using. I'm using the g++ that comes with
> XCode.
>
> i686-apple-darwin11-llvm-g++-4.2 (GCC) 4.2.1 (Based on Apple Inc. build
> 5658) (LLVM build 2336.11.00)

I am using gcc 4.7.0

Nolis-MacBook-Pro:~ nsicad$ gcc --version
gcc (GCC) 4.7.0
Copyright (C) 2012 Free Software Foundation, Inc.
This is free software; see the source for copying conditions.  There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.

I'll try upgrade to 4.7.2 and see what will happen.

Noli