papi: Update to 5.6.0 and fix build with %gcc@8 (#8796)
papi: Update to 5.6.0 and fix build with %gcc@8 (#8796)


mfherbst/spack,mfherbst/spack,LLNL/spack,iulian787/spack,LLNL/spack,krafczyk/spack,krafczyk/spack,krafczyk/spack,LLNL/spack,iulian787/spack,iulian787/spack,LLNL/spack,krafczyk/spack,LLNL/spack,mfherbst/spack,iulian787/spack,mfherbst/spack,iulian787/spack,mfherbst/spack,krafczyk/spack