Constant magic::flags::NO_CHECK_BUILTIN

pub const NO_CHECK_BUILTIN: CookieFlags = CookieFlags{bits:
                NO_CHECK_COMPRESS.bits | NO_CHECK_TAR.bits |
                    NO_CHECK_APPTYPE.bits | NO_CHECK_ELF.bits |
                    NO_CHECK_TEXT.bits | NO_CHECK_CDF.bits |
                    NO_CHECK_TOKENS.bits | NO_CHECK_ENCODING.bits,}

No built-in tests; only consult the magic file