Only check for certificates if it is supported

Signed-off-by: Gabor Mezei <gabor.mezei@arm.com>
diff --git a/programs/ssl/ssl_test_common_source.c b/programs/ssl/ssl_test_common_source.c
index 6c7eed5..354e97e 100644
--- a/programs/ssl/ssl_test_common_source.c
+++ b/programs/ssl/ssl_test_common_source.c
@@ -315,6 +315,7 @@
 };
 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 
+#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)
 #if defined(MBEDTLS_X509_CRT_PARSE_C)
 /** Functionally equivalent to mbedtls_x509_crt_verify_info, see that function
  *  for more info.
@@ -352,7 +353,6 @@
 }
 #endif /* MBEDTLS_X509_CRT_PARSE_C */
 
-#if defined(MBEDTLS_SSL_HANDSHAKE_WITH_CERT_ENABLED)
 static void mbedtls_print_supported_sig_algs(void)
 {
     mbedtls_printf("supported signature algorithms:\n");