Revert Merge #82310: nixos/systemd: apply .link

...even when networkd is disabled

This reverts commit ce78f3ac701017008aa7f1db387b871b7ae65e01, reversing
changes made to dc34da0755b3c36469965659c0ee4a1337e81c05.

I'm sorry; Hydra has been unable to evaluate, always returning
> error: unexpected EOF reading a line
and I've been unable to reproduce the problem locally.  Bisecting
pointed to this merge, but I still can't see what exactly was wrong.

1 files changed, 8 insertions, 9 deletions

diff --git a/nixos/modules/services/networking/zerotierone.nix b/nixos/modules/services/networking/zerotierone.nix
index cf39ed065a76..042c4d5adddd 100644
--- a/nixos/modules/services/networking/zerotierone.nix
+++ b/nixos/modules/services/networking/zerotierone.nix
@@ -69,14 +69,13 @@ in
     environment.systemPackages = [ cfg.package ];
 
     # Prevent systemd from potentially changing the MAC address
-    systemd.network.links."50-zerotier" = {
-      matchConfig = {
-        OriginalName = "zt*";
-      };
-      linkConfig = {
-        AutoNegotiation = false;
-        MACAddressPolicy = "none";
-      };
-    };
+    environment.etc."systemd/network/50-zerotier.link".text = ''
+      [Match]
+      OriginalName=zt*
+
+      [Link]
+      AutoNegotiation=false
+      MACAddressPolicy=none
+    '';
   };
 }