Tests: fixed ssl_certificates.t for nginx built with OpenSSL 0.9.8.

OpenSSL 0.9.8 covers ECC-based ciphersuites under pre-RFC4492 "ECCdraft" alias.

ssl_certificates.t

diff --git a/ssl_certificates.t b/ssl_certificates.t
index 96ee71c..50137cb 100644
--- a/ssl_certificates.t
+++ b/ssl_certificates.t
@@ -43,6 +43,7 @@
 
     ssl_certificate_key rsa.key;
     ssl_certificate rsa.crt;
+    ssl_ciphers DEFAULT:ECCdraft;
 
     server {
         listen       127.0.0.1:8080 ssl;