libusb: get rid of systemd from library closures

pkgs/development/libraries/libusb/default.nix

@@ -3,6 +3,9 @@
 stdenv.mkDerivation {
   name = "libusb-compat-0.1.5";
 
+  outputs = [ "dev" "out" ]; # get rid of propagating systemd closure
+  outputBin = "dev";
+
   nativeBuildInputs = [ pkgconfig ];
   propagatedBuildInputs = [ libusb1 ];