Flagged extended key usage call with mbedTLS flags

Author: Mika Leppänen

source/Security/protocols/tls_sec_prot/tls_sec_prot_lib.c

@@ -530,11 +530,13 @@ static int8_t tls_sec_prot_lib_subject_alternative_name_validate(mbedtls_x509_cr
 
 static int8_t tls_sec_prot_lib_extended_key_usage_validate(mbedtls_x509_crt *crt)
 {
+#if defined(MBEDTLS_X509_CHECK_EXTENDED_KEY_USAGE)
     // Extended key usage must be present
     if (mbedtls_x509_crt_check_extended_key_usage(crt, MBEDTLS_OID_WISUN_FAN, sizeof(MBEDTLS_OID_WISUN_FAN) - 1) != 0) {
         tr_error("invalid extended key usage");
         return -1; // FAIL
     }
+#endif
     return 0;
 }