nomad: buildFlagsArray -> tags

pkgs/applications/networking/cluster/nomad/generic.nix

@@ -29,16 +29,7 @@ buildGoPackage rec {
   # ui:
   #  Nomad release commits include the compiled version of the UI, but the file
   #  is only included if we build with the ui tag.
-  preBuild =
-    let
   tags = [ "ui" ] ++ lib.optional (!nvidiaGpuSupport) "nonvidia";
-      tagsString = lib.concatStringsSep " " tags;
-    in
-    ''
-      export buildFlagsArray=(
-        -tags="${tagsString}"
-      )
-    '';
 
   # The dependency on NVML isn't explicit. We have to make it so otherwise the
   # binary will not know where to look for the relevant symbols.