Make ctests platform independent #564

Job	Run time
ubuntu_latest_autotools	10m 34s
macos_latest_cmake	3m 22s
macos_latest_cmake_python	4m 13s
macos_latest_autotools	3m 26s
ubuntu_latest_autotools_ilp64	1m 22s
ubuntu_latest_autotools_install	16m 24s
ubuntu_latest_cmake	3m 31s
ubuntu_latest_cmake_install	8m 50s
ubuntu_latest_cmake_python	8m 29s
MinGW-w64 UCRT64 INTERFACE64=ON/MPI=OFF	5m 27s
MinGW-w64 UCRT64 INTERFACE64=OFF/MPI=ON	6m 21s
MinGW-w64 UCRT64 INTERFACE64=OFF/MPI=OFF	6m 4s
MinGW-w64 CLANG64 INTERFACE64=ON/MPI=OFF	4m 48s
MinGW-w64 CLANG64 INTERFACE64=OFF/MPI=ON	5m 18s
MinGW-w64 CLANG64 INTERFACE64=OFF/MPI=OFF	5m 3s
	1h 33m 12s

Provide feedback