Stop advertising midstate support until it's fixed.
diff --git a/util.c b/util.c
index 733d8ad..46a2aa3 100644
--- a/util.c
+++ b/util.c
@@ -373,7 +373,7 @@ json_t *json_rpc_call(CURL *curl, const char *url,
headers = curl_slist_append(headers,
"Content-type: application/json");
headers = curl_slist_append(headers,
- "X-Mining-Extensions: longpoll midstate rollntime");
+ "X-Mining-Extensions: longpoll rollntime");
headers = curl_slist_append(headers, len_hdr);
headers = curl_slist_append(headers, user_agent_hdr);
headers = curl_slist_append(headers, "Expect:"); /* disable Expect hdr*/