$OpenBSD: patch-src_devices_giolister_cpp,v 1.1 2019/08/11 20:42:44 cwen Exp $

Add missing header for ports-gcc, from upstream:
https://github.com/clementine-player/Clementine/pull/5630/commits/a2f7d018c7bdee96d4cefd5a1ec0c4f710fea226

Index: src/devices/giolister.cpp
--- src/devices/giolister.cpp.orig
+++ src/devices/giolister.cpp
@@ -17,6 +17,7 @@
 
 #include "config.h"
 
+#include <functional>
 #include <memory>
 
 #include <QFile>
