Update CMakeLists.txt for LIBSNDFILE
Update CMakeLists.txt for LIBSNDFILE

git-svn-id: http://svn.code.sf.net/p/petavision/code/sandbox@7408 7c0444ca-5550-0410-9008-faecdbe78eb5

Former-commit-id: 25f873bd411e442c851521598ed70455a8332480
dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,PetaVision/OpenPV,dpaiton/OpenPV,dpaiton/OpenPV,PetaVision/OpenPV