XCB: print server version infos in the debug

modules/video_output/xcb/common.c

@@ -71,6 +71,17 @@ xcb_connection_t *Connect (vlc_object_t *obj)
         xcb_disconnect (conn);
         return NULL;
     }
+
+    const xcb_setup_t *setup = xcb_get_setup (conn);
+    msg_Dbg (obj, "connected to X%"PRIu16".%"PRIu16" server",
+             setup->protocol_major_version, setup->protocol_minor_version);
+    char *vendor = strndup (xcb_setup_vendor (setup), setup->vendor_len);
+    if (vendor)
+    {
+        msg_Dbg (obj, " vendor : %s", vendor);
+        free (vendor);
+    }
+    msg_Dbg (obj, " version: %"PRIu32, setup->release_number);
     return conn;
 }