Prefer system modules over CMAKE_MODULE_PATH.
Prefer system modules over CMAKE_MODULE_PATH.

Change the order of CMAKE_MODULE_PATH does not solve the intended use. To
prefer system CMake modules, CMP0017 has to be set to NEW, too.

RWTH-ELP/PnMPI,RWTH-HPC/PnMPI,RWTH-HPC/PnMPI,RWTH-HPC/PnMPI,RWTH-ELP/PnMPI,RWTH-ELP/PnMPI