intel compiler complains returning a const type

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1604 c368ceb8-fd28-0410-a457-e46ee1d7cd4a
add CXXFLAGS in README.CRAY

git-svn-id: https://svn.mcs.anl.gov/repos/parallel-netcdf/trunk@1605 c368ceb8-fd28-0410-a457-e46ee1d7cd4a