fix install method of cereal (#5094)
fix install method of cereal (#5094)

* removed unnecessary install method from cereal

* attempt to fix flake8 error

* adjusted install method

* add CMake options instead of manually patching stuff

* flake8

tmerrick1/spack,iulian787/spack,skosukhin/spack,lgarren/spack,tmerrick1/spack,mfherbst/spack,mfherbst/spack,lgarren/spack,lgarren/spack,TheTimmy/spack,krafczyk/spack,iulian787/spack,EmreAtes/spack,matthiasdiener/spack,iulian787/spack,skosukhin/spack,matthiasdiener/spack,mfherbst/spack,matthiasdiener/spack,krafczyk/spack,iulian787/spack,TheTimmy/spack,lgarren/spack,TheTimmy/spack,TheTimmy/spack,LLNL/spack,EmreAtes/spack,tmerrick1/spack,lgarren/spack,krafczyk/spack,krafczyk/spack,tmerrick1/spack,krafczyk/spack,skosukhin/spack,LLNL/spack,EmreAtes/spack,skosukhin/spack,matthiasdiener/spack,LLNL/spack,EmreAtes/spack,EmreAtes/spack,TheTimmy/spack,mfherbst/spack,matthiasdiener/spack,skosukhin/spack,LLNL/spack,iulian787/spack,mfherbst/spack,tmerrick1/spack,LLNL/spack