iwd: avoid error in the logs about a non-existing netdev group

pkgs/by-name/iw/iwd/no_netdev_group.diff

@@ -0,0 +1,30 @@
+diff --git a/src/iwd-dbus.conf b/src/iwd-dbus.conf
+index f2509ebc..a443987d 100644
+--- a/src/iwd-dbus.conf
++++ b/src/iwd-dbus.conf
+@@ -19,10 +19,6 @@
+     <allow send_destination="net.connman.iwd"/>
+   </policy>
+ 
+-  <policy group="netdev">
+-    <allow send_destination="net.connman.iwd"/>
+-  </policy>
+-
+   <policy context="default">
+     <deny send_destination="net.connman.iwd"/>
+   </policy>
+diff --git a/wired/ead-dbus.conf b/wired/ead-dbus.conf
+index 8a685e0a..749d0c05 100644
+--- a/wired/ead-dbus.conf
++++ b/wired/ead-dbus.conf
+@@ -17,10 +17,6 @@
+     <allow send_destination="net.connman.ead"/>
+   </policy>
+ 
+-  <policy group="netdev">
+-    <allow send_destination="net.connman.ead"/>
+-  </policy>
+-
+   <policy context="default">
+     <deny send_destination="net.connman.ead"/>
+   </policy>

pkgs/by-name/iw/iwd/package.nix

@@ -23,6 +23,12 @@ stdenv.mkDerivation (finalAttrs: {
     hash = "sha256-NY0WB62ehxKH64ssAF4vkF6YroG5HHH+ii+AFG9EaE4=";
   };
 
+  patches = [
+    # Remove dbus config referencing the netdev group, which we don't have.
+    # Users are advised to use the wheel group instead.
+    ./no_netdev_group.diff
+  ];
+
   outputs = [
     "out"
     "man"