bugfix: compilation failed with nginx cores older than 1.9.0. this regression had appeared in the previous commit.

Author: agentzh

README.md

@@ -153,7 +153,7 @@ The return value is an array-like Lua table for all the primary peers. Each tabl
     Timestamp for the last check (in seconds since the Epoch)
 * conns
 
-    Number of active connections to the peer.
+    Number of active connections to the peer (this requires NGINX 1.9.0 or above).
 
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src/ngx_http_lua_upstream_module.c

@@ -438,9 +438,11 @@ ngx_http_lua_get_peer(lua_State *L, ngx_http_upstream_rr_peer_t *peer,
     lua_pushinteger(L, (lua_Integer) peer->effective_weight);
     lua_rawset(L, -3);
 
+#if (nginx_version >= 1009000)
     lua_pushliteral(L, "conns");
     lua_pushinteger(L, (lua_Integer) peer->conns);
     lua_rawset(L, -3);
+#endif
 
     lua_pushliteral(L, "fails");
     lua_pushinteger(L, (lua_Integer) peer->fails);