Fix xfce4-13.xfce4-mixer build https://hydra.nixos.org/build/80708915.#45971

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AmineChikhaoui wants to merge 1 commit intoNixOS:masterfrom AmineChikhaoui:zhf-18.09-xfce4-mixer

+3-1

Commits on Sep 3, 2018

Fix xfce4-13.xfce4-mixer build https://hydra.nixos.org/build/80708915 .
AmineChikhaoui
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