Make optimize and debug mutually exclusive, with debug the default so that coverage works
Make optimize and debug mutually exclusive, with debug the default so that coverage works

hildjj/cn-cbor,jimsch/cn-cbor,hildjj/cn-cbor,cabo/cn-cbor,jimsch/cn-cbor,jimsch/cn-cbor,obgm/cn-cbor,obgm/cn-cbor,cabo/cn-cbor