Small change to the Build module: add library file extension for non-OSX systems.
Small change to the Build module: add library file extension for non-OSX systems.

pombredanne/paperpile,jondo/paperpile,pombredanne/paperpile,jondo/paperpile,jondo/paperpile,pombredanne/paperpile,pombredanne/paperpile,jondo/paperpile,jondo/paperpile,pombredanne/paperpile