SSL: compatibility with OpenSSL master branch.

RAND_pseudo_bytes() is deprecated in the OpenSSL master branch, so the only
use was changed to RAND_bytes().  Access to internal structures is no longer
possible, so now we don't try to set SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS even
if it's defined.

src/event/ngx_event_openssl.c

diff --git a/src/event/ngx_event_openssl.c b/src/event/ngx_event_openssl.c
index 1b789e6..e9edf31 100644
--- a/src/event/ngx_event_openssl.c
+++ b/src/event/ngx_event_openssl.c
@@ -1158,6 +1158,7 @@
         c->recv_chain = ngx_ssl_recv_chain;
         c->send_chain = ngx_ssl_send_chain;
 
+#if OPENSSL_VERSION_NUMBER < 0x10100000L
 #ifdef SSL3_FLAGS_NO_RENEGOTIATE_CIPHERS
 
         /* initial handshake done, disable renegotiation (CVE-2009-3555) */
@@ -1166,6 +1167,7 @@
         }
 
 #endif
+#endif
 
         return NGX_OK;
     }
@@ -2861,7 +2863,7 @@
                        ngx_hex_dump(buf, key[0].name, 16) - buf, buf,
                        SSL_session_reused(ssl_conn) ? "reused" : "new");
 
-        RAND_pseudo_bytes(iv, 16);
+        RAND_bytes(iv, 16);
         EVP_EncryptInit_ex(ectx, EVP_aes_128_cbc(), NULL, key[0].aes_key, iv);
         HMAC_Init_ex(hctx, key[0].hmac_key, 16,
                      ngx_ssl_session_ticket_md(), NULL);