resolve issue #255, no sha284 with wolfssl cert chain and external test

examples/client/client.c

@@ -776,6 +776,12 @@ THREAD_RETURN WOLFSSL_THREAD client_test(void* args)
             }
         #endif
 
+        #if !defined(WOLFSSL_SHA384)
+            if (!XSTRNCMP(domain, "www.wolfssl.com", 15)) {
+                done = 1;  /* wolfssl need sha384 for cert chain verify */
+            }
+        #endif
+
         #if !defined(HAVE_AESGCM) && defined(NO_AES) && \
             !(defined(HAVE_CHACHA) && defined(HAVE_POLY1305))
             done = 1;  /* need at least on of these for external tests */