vault, vault-bin: fix build for darwin

Closes #129443

(cherry picked from commit e0cda3708af3a38397f4f0f1c3d8a3fbad222c48)

pkgs/tools/security/vault/vault-bin.nix

@@ -40,10 +40,10 @@ in stdenv.mkDerivation {
     mkdir -p $out/bin $out/share/bash-completion/completions
     mv vault $out/bin
     echo "complete -C $out/bin/vault vault" > $out/share/bash-completion/completions/vault
-
+  '' + lib.optionalString stdenv.isLinux ''
     wrapProgram $out/bin/vault \
       --prefix PATH ${lib.makeBinPath [ gawk glibc ]}
-
+  '' + ''
     runHook postInstall
   '';