cmake ParMETIS examples

NGSolve/ngsolve cmake/external_projects/mumps.cmake :9 

find_package(PARMETIS REQUIRED)

SCOREC/core cmake/FindZoltan.cmake :20 

find_package(Parmetis MODULE REQUIRED)

elemental/Elemental cmake/external_projects/ElMath/ParMETIS.cmake :16 

find_package(ParMETIS)

pghysels/STRUMPACK CMakeLists.txt :478 

find_package(ParMETIS)

SeisSol/SeisSol CMakeLists.txt :361 

find_package(ParMETIS REQUIRED)

xiaoyeli/superlu_dist CMakeLists.txt :466 

find_package(ParMETIS)