cf-dc-api.pl: handle old-as-the-hills Test::Harness versions that do not have execute_tests
cf-dc-api.pl: handle old-as-the-hills Test::Harness versions that do not have execute_tests

bdurrow/design-center,tzz/design-center,tzz/design-center,tzz/design-center,bdurrow/design-center,bdurrow/design-center,tzz/design-center,bdurrow/design-center