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/system/safe-rm/default.nix

@@ -0,0 +1,36 @@
+{ lib, rustPlatform, fetchgit, coreutils, installShellFiles }:
+
+rustPlatform.buildRustPackage rec {
+  pname = "safe-rm";
+  version = "1.1.0";
+
+  src = fetchgit {
+    url = "https://git.launchpad.net/safe-rm";
+    rev = "refs/tags/${pname}-${version}";
+    sha256 = "sha256-7+4XwsjzLBCQmHDYNwhlN4Yg3eL43GUEbq8ROtuP2Kw=";
+  };
+
+  cargoSha256 = "sha256-durb4RTzEun7HPeYfvDJpvO+6L7tNFmAxdIwINbwZrg=";
+
+  postPatch = ''
+    substituteInPlace src/main.rs \
+      --replace "/bin/rm" "${coreutils}/bin/rm"
+  '';
+
+  nativeBuildInputs = [ installShellFiles ];
+
+  # uses lots of absolute paths outside of the sandbox
+  doCheck = false;
+
+  postInstall = ''
+    installManPage safe-rm.1
+  '';
+
+  meta = with lib; {
+    description = "Tool intended to prevent the accidental deletion of important files";
+    homepage = "https://launchpad.net/safe-rm";
+    license = licenses.gpl3Plus;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ SuperSandro2000 ];
+  };
+}