Add .dylib suffix for PlaformFiles target.
Add .dylib suffix for PlaformFiles target.

Gjacquenot/simbody,elen4/simbody,chrisdembia/simbody,elkingtonmcb/simbody,scamille/simbody,robojukie/simbody,Gjacquenot/simbody,elen4/simbody,chrisdembia/simbody,scamille/simbody,Gjacquenot/simbody,elkingtonmcb/simbody,chrisdembia/simbody,robojukie/simbody,elkingtonmcb/simbody,scamille/simbody,simbody/simbody,robojukie/simbody,simbody/simbody