test/CMakeLists.txt: added some comments about requirements

Author: firewave

test/CMakeLists.txt

@@ -60,7 +60,8 @@ if (BUILD_TESTS)
     endif()
 
     if (REGISTER_TESTS)
-        # CMP0064 requires 3.4
+        # CMP0057 requires 3.3 - if (IN_LIST)
+        # CMP0064 requires 3.4 - if (TEST)
         # CMAKE_MATCH_<n> usage for if (MATCHES) requires 3.9
         cmake_minimum_required(VERSION 3.9)
         cmake_policy(SET CMP0064 NEW)