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/security/spectre-meltdown-checker/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv, fetchFromGitHub, makeWrapper, coreutils, binutils-unwrapped }:
+
+stdenv.mkDerivation rec {
+  pname = "spectre-meltdown-checker";
+  version = "0.45";
+
+  src = fetchFromGitHub {
+    owner = "speed47";
+    repo = "spectre-meltdown-checker";
+    rev = "v${version}";
+    sha256 = "sha256-yGrsiPBux4YeiQ3BL2fnne5P55R/sQZ4FwzSkE6BqPc=";
+  };
+
+  prePatch = ''
+    substituteInPlace spectre-meltdown-checker.sh \
+      --replace /bin/echo ${coreutils}/bin/echo
+  '';
+
+  nativeBuildInputs = [ makeWrapper ];
+
+  installPhase = with lib; ''
+    runHook preInstall
+
+    install -Dm755 spectre-meltdown-checker.sh $out/bin/spectre-meltdown-checker
+    wrapProgram $out/bin/spectre-meltdown-checker \
+      --prefix PATH : ${makeBinPath [ binutils-unwrapped ]}
+
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Spectre & Meltdown vulnerability/mitigation checker for Linux";
+    homepage = "https://github.com/speed47/spectre-meltdown-checker";
+    license = licenses.gpl3;
+    maintainers = with maintainers; [ dotlambda ];
+    platforms = platforms.linux;
+  };
+}