fix warning about XfceKiosk redefinition in libxfce4util.h
on openbsd since a while i have this warning building anything that includes libxfce4util.h (so lots of things) ``` In file included from xfce-shortcut-dialog.c:30: In file included from /usr/local/include/xfce4/libxfce4util/libxfce4util.h:33: /usr/local/include/xfce4/libxfce4util/xfce-kiosk.h:37:27: warning: redefinition of typedef 'XfceKiosk' is a C11 feature [-Wtypedef-redefinition] typedef struct _XfceKiosk XfceKiosk; ^ /usr/local/include/xfce4/libxfce4util/xfce-kiosk.h:35:23: note: previous definition is here G_DECLARE_FINAL_TYPE (XfceKiosk, xfce_kiosk, XFCE, KIOSK, GObject) ^ 1 warning generated. ``` that's afaict with the default build flags in release mode - commenting line 37 seems to silence the warning and doesnt seem to cause other build issues but that's to check with all libxfce4util consumers..
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