uboot: (firmwareOdroidC2/C4) don't invoke patch tool, use patches = [] instead

https://github.com/NixOS/nixpkgs/blob/master/pkgs/stdenv/generic/setup.sh#L948
this can do it nicely.

Signed-off-by: Anton Arapov <anton@deadbeef.mx>

pkgs/tools/networking/zs-wait4host/default.nix

@@ -0,0 +1,34 @@
+{ coreutils, fetchurl, fping, lib, stdenvNoCC }:
+
+stdenvNoCC.mkDerivation rec {
+  pname = "zs-wait4host";
+  version = "0.3.2";
+
+  src = fetchurl {
+    url = "https://ytrizja.de/distfiles/${pname}-${version}.tar.gz";
+    sha256 = "9F1264BDoGlRR7bWlRXhfyvxWio4ydShKmabUQEIz9I=";
+  };
+
+  postPatch = ''
+    for i in zs-wait4host zs-wait4host-inf; do
+      substituteInPlace "$i" \
+        --replace '$(zs-guess-fping)' '${fping}/bin/fping' \
+        --replace ' sleep ' ' ${coreutils}/bin/sleep ' \
+        --replace '[ "$FPING" ] || exit 1' ""
+    done
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    install -D -t $out/bin zs-wait4host zs-wait4host-inf
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Wait for a host to come up/go down";
+    homepage = "https://ytrizja.de/";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ zseri ];
+    platforms = platforms.all;
+  };
+}