add gfortran64 for Eve

it has the following commands:

module purge
module load foss/2018a
module load netCDF-Fortran
module load CMake
module use /global/apps/modulefiles
module load python_env_mpr
export NETCDF_DIR="$EBROOTNETCDF"
export NETCDF_FORTRAN_DIR="$EBROOTNETCDFMINFORTRAN"
export FC=mpifort

pFUnit is not available for gfortran64