new package: racon (bioinformatics) (#7726)
new package: racon (bioinformatics) (#7726)

* new package: racon (bioinformatics)

* add cmake_arg method

EmreAtes/spack,mfherbst/spack,EmreAtes/spack,LLNL/spack,krafczyk/spack,iulian787/spack,LLNL/spack,matthiasdiener/spack,LLNL/spack,matthiasdiener/spack,tmerrick1/spack,krafczyk/spack,mfherbst/spack,LLNL/spack,krafczyk/spack,krafczyk/spack,tmerrick1/spack,matthiasdiener/spack,mfherbst/spack,iulian787/spack,iulian787/spack,iulian787/spack,iulian787/spack,EmreAtes/spack,mfherbst/spack,matthiasdiener/spack,EmreAtes/spack,krafczyk/spack,tmerrick1/spack,tmerrick1/spack,EmreAtes/spack,LLNL/spack,mfherbst/spack,tmerrick1/spack,matthiasdiener/spack