[wing/wip/nacho/poll-stream] Add missing include

[Ignacio Casal Quinteiro <icq src gnome org>]

commit 3dcd4bdbe98899adb1fed2536584512a4ea282ac
Author: Ignacio Casal Quinteiro <qignacio amazon com>
Date:   Thu Nov 29 10:02:20 2018 +0100

    Add missing include

 wing/wingoutputstream.h | 1 +
 1 file changed, 1 insertion(+)
---
diff --git a/wing/wingoutputstream.h b/wing/wingoutputstream.h
index 406b9a5..6f1ff6a 100644
--- a/wing/wingoutputstream.h
+++ b/wing/wingoutputstream.h
@@ -24,6 +24,7 @@
 #define WING_OUTPUT_STREAM_H
 
 #include <gio/gio.h>
+#include <wing/wingversionmacros.h>
 
 G_BEGIN_DECLS