Send orca-formatted user agent for all HTTP requests too

Fixes "Failed to parse thread information" errors when joining channels.

Facebook rolled a hotfix update today and they are requiring the same
user agent for HTTP requests too. As far as I can see the main affected
request is ThreadQuery.

Hopefully this also solves issues some a tiny minority of people were
still having with sync sequence ids.

facebook/facebook-api.h

@@ -88,27 +88,37 @@
  */
 #define FB_API_SECRET  "374e60f8b9bb6b8cbb30f78030438895"
 
+/**
+ * FB_ORCA_AGENT
+ *
+ * The part of the user agent that looks like the official client, since the
+ * server started checking this.
+ *
+ * We announce ourselves as compatible with Orca-Android 38.0 since that's the
+ * closest version to the last major protocol update. Some parts use older
+ * features, some parts use newer ones.
+ *
+ * Fun fact: this version sends old-style MQIsdp CONNECT messages for the first
+ * connection, with JSON payloads instead of compressed thrift.
+ *
+ */
+
+#define FB_ORCA_AGENT "[FBAN/Orca-Android;FBAV/38.0.0.22.155;FBBV/14477681]"
+
 /**
  * FB_API_AGENT:
  *
  * The HTTP User-Agent header.
  */
-#define FB_API_AGENT  "Facebook plugin / BitlBee / " PACKAGE_VERSION
+#define FB_API_AGENT  "Facebook plugin / BitlBee / " PACKAGE_VERSION " " FB_ORCA_AGENT
 
 /**
  * FB_API_MQTT_AGENT
  *
  * The client information string sent in the MQTT CONNECT message
- *
- * We announce ourselves as compatible with Orca-Android 38.0 since that's the
- * closest version to the last major protocol update. Some parts use older
- * features, some parts use newer ones.
- *
- * Fun fact: this version sends old-style MQIsdp CONNECT messages for the first
- * connection, with JSON payloads instead of compressed thrift.
  */
 
-#define FB_API_MQTT_AGENT FB_API_AGENT " [FBAN/Orca-Android;FBAV/38.0.0.22.155;FBBV/14477681]"
+#define FB_API_MQTT_AGENT FB_API_AGENT
 
 
 /**