nixos/no-x-libs: add libplacebo

      intel-vaapi-driver = super.intel-vaapi-driver.override { enableGui = false; };

      libdevil = super.libdevil-nox;

      libextractor = super.libextractor.override { gtkSupport = false; };

      libplacebo = super.libplacebo.override { vulkanSupport = false; };

      libva = super.libva-minimal;

      limesuite = super.limesuite.override { withGui = false; };

      mc = super.mc.override { x11Support = false; };