Added PJSIP patch that fixes CRC32 on big-endian machines

darcs-hash:20090218141811-58103-6cc542d03c10772e8489db4e58f3b5c62684cd1e
update msrp.py

darcs-hash:20090218142819-b2873-a6347edf1abcc074fdf0cd066b189054da61a168