Fix gcc portability problem.
Fix gcc portability problem.

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