clean up hacky scons rule for editing the SWIG-generated opensync.py
clean up hacky scons rule for editing the SWIG-generated opensync.py

unfortunately it doesn't seem possible to have SWIG generate the code we 
need, so the sed is still required, but at least it is a little cleaner now


git-svn-id: e31799a7ad59d6ea355ca047c69e0aee8a59fcd3@1759 53f5c7ee-bee3-0310-bbc5-ea0e15fffd5e

luizluca/opensync-luizluca,luizluca/opensync-luizluca