libgff: new package at version 2.0.0 (#20233)
libgff: new package at version 2.0.0 (#20233)

* libgff: new package at version 2.0.0

* Removed default cmake function, fixed flake8 error

* Fixed errors
LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack,LLNL/spack