Update leveldb to 1.20 (#3441)
Update leveldb to 1.20 (#3441)


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