Fixed compilation problems under GCC
Fixed compilation problems under GCC

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