mysql: Use correct python command (#13393)
mysql: Use correct python command (#13393)

* mysql: Use correct python command

python~pythoncmd does not provide a python symlink for python3, so make
sure we pick the right command.

* mysql: Adapt to build env changes

iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,iulian787/spack,LLNL/spack,LLNL/spack,iulian787/spack