cmake PARU_HAS_OPENMP examples

jlblancoc/suitesparse-metis-for-windows SuiteSparse/ParU/CMakeLists.txt :91

message ( STATUS "ParU has OpenMP: ${PARU_HAS_OPENMP}" )

DrTimothyAldenDavis/SuiteSparse ParU/CMakeLists.txt :94

message ( STATUS "ParU has OpenMP: ${PARU_HAS_OPENMP}" )