Added PJSIP patch for adaptive G722 bitshifting

Ignore-this: aeddd9a1594ed1421be6ed7b8ab172df

darcs-hash:20100624121812-56b4d-3ccd7835da94654fb702768c7bac8cab206c3ac1
Updated Windows installation instructions

Ignore-this: 8b410343f3feb79083f746015abae500

darcs-hash:20100707153003-56b4d-62aa77eb0b93c28afd289c21d9f787a58a6101b0