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/misc/keychain/default.nix

@@ -0,0 +1,58 @@
+{ lib
+, stdenv
+, fetchFromGitHub
+, installShellFiles
+, makeWrapper
+, coreutils
+, openssh
+, gnupg
+, perl
+, procps
+, gnugrep
+, gawk
+, findutils
+, gnused
+}:
+
+stdenv.mkDerivation rec {
+  pname = "keychain";
+  version = "2.8.5";
+
+  src = fetchFromGitHub {
+    owner = "funtoo";
+    repo = "keychain";
+    rev = version;
+    sha256 = "1bkjlg0a2bbdjhwp37ci1rwikvrl4s3xlbf2jq2z4azc96dr83mj";
+  };
+
+  nativeBuildInputs = [ installShellFiles makeWrapper ];
+  buildInputs = [ perl ];
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp keychain $out/bin/keychain
+    installManPage keychain.1
+    wrapProgram $out/bin/keychain \
+      --prefix PATH ":" "${lib.makeBinPath [ coreutils findutils gawk gnupg gnugrep gnused openssh procps ]}" \
+  '';
+
+  meta = with lib; {
+    description = "Keychain management tool";
+    longDescription = ''
+      Keychain helps you to manage SSH and GPG keys in a convenient and secure
+      manner. It acts as a frontend to ssh-agent and ssh-add, but allows you
+      to easily have one long running ssh-agent process per system, rather
+      than the norm of one ssh-agent per login session.
+
+      This dramatically reduces the number of times you need to enter your
+      passphrase. With keychain, you only need to enter a passphrase once
+      every time your local machine is rebooted. Keychain also makes it easy
+      for remote cron jobs to securely "hook in" to a long-running ssh-agent
+      process, allowing your scripts to take advantage of key-based logins.
+    '';
+    homepage = "https://www.funtoo.org/Keychain";
+    license = licenses.gpl2;
+    platforms = platforms.unix;
+    maintainers = with maintainers; [ sigma SuperSandro2000 ];
+  };
+}