Update minimum CMake version to 3.5 and set policy version (#161)

Author: ncdorn

CMakeLists.txt

@@ -28,7 +28,8 @@
 # NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 # SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-cmake_minimum_required(VERSION 3.22)
+set(CMAKE_POLICY_VERSION_MINIMUM 3.5)
+cmake_minimum_required(VERSION 3.5)
 set(CMAKE_CXX_STANDARD 17)
 set(CMAKE_CXX_STANDARD_REQUIRED True)