GUAC-935: Add missing headers. Fix test for PubSub.

configure.ac

@@ -491,10 +491,10 @@ fi
 # Support for "PubSub" event system
 if test "x${have_freerdp}" = "xyes"
 then
-    AC_CHECK_MEMBERS([rdpContext.pubSub],
-                     [AC_DEFINE([HAVE_FREERDP_PUBSUB],,
+    AC_CHECK_DECL([PubSub_SubscribeChannelConnected],
+        [AC_DEFINE([HAVE_FREERDP_EVENT_PUBSUB],,
                    [Whether this version of FreeRDP provides the PubSub event system])],,
-                     [[#include <freerdp/freerdp.h>]])
+        [#include <freerdp/event.h>])
 fi
 
 # Addin registration variations

src/protocols/rdp/client.c

@@ -57,6 +57,14 @@
 #include "compat/client-cliprdr.h"
 #endif
 
+#ifdef HAVE_FREERDP_CLIENT_DISP_H
+#include <freerdp/client/disp.h>
+#endif
+
+#ifdef HAVE_FREERDP_EVENT_PUBSUB
+#include <freerdp/event.h>
+#endif
+
 #ifdef ENABLE_WINPR
 #include <winpr/wtypes.h>
 #else
@@ -146,7 +154,7 @@ int __guac_receive_channel_data(freerdp* rdp_inst, int channelId, UINT8* data, i
     return freerdp_channels_data(rdp_inst, channelId, data, size, flags, total_size);
 }
 
-#ifdef HAVE_FREERDP_PUBSUB
+#ifdef HAVE_FREERDP_EVENT_PUBSUB
 /**
  * Called whenever a channel connects.
  */
@@ -204,7 +212,7 @@ BOOL rdp_freerdp_pre_connect(freerdp* instance) {
         guac_client_log(client, GUAC_LOG_WARNING,
                 "Failed to load drdynvc plugin.");
 
-#ifdef HAVE_FREERDP_PUBSUB
+#ifdef HAVE_FREERDP_EVENT_PUBSUB
     /* Subscribe to and handle channel connected events */
     PubSub_SubscribeChannelConnected(context->pubSub,
             (pChannelConnectedEventHandler) guac_rdp_channel_connected);