BUILD: ssl: disable OCSP when using boringssl

Google's boringssl doesn't currently support OCSP, so
disable it if detected.

OCSP support may be reintroduced as per:
https://code.google.com/p/chromium/issues/detail?id=398677

In that case we can simply revert this commit.

Signed-off-by: Lukas Tribus <luky-37@hotmail.com>
diff --git a/include/proto/ssl_sock.h b/include/proto/ssl_sock.h
index 3e111cd..6362953 100644
--- a/include/proto/ssl_sock.h
+++ b/include/proto/ssl_sock.h
@@ -54,7 +54,7 @@
 int ssl_sock_get_cert_used(struct connection *conn);
 int ssl_sock_get_remote_common_name(struct connection *conn, struct chunk *out);
 unsigned int ssl_sock_get_verify_result(struct connection *conn);
-#ifdef SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB
+#if (defined SSL_CTRL_SET_TLSEXT_STATUS_REQ_CB && !defined OPENSSL_IS_BORINGSSL)
 int ssl_sock_update_ocsp_response(struct chunk *ocsp_response, char **err);
 #endif