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/stunnel/default.nix

@@ -0,0 +1,38 @@
+{ lib, stdenv, fetchurl, openssl }:
+
+stdenv.mkDerivation rec {
+  pname = "stunnel";
+  version = "5.64";
+
+  src = fetchurl {
+    url    = "https://www.stunnel.org/downloads/${pname}-${version}.tar.gz";
+    sha256 = "sha256-7r5T7RFrpDsueGdisMK5FRHnt0hXrUdlgk5xmeb6+IM=";
+    # please use the contents of "https://www.stunnel.org/downloads/${name}.tar.gz.sha256",
+    # not the output of `nix-prefetch-url`
+  };
+
+  buildInputs = [ openssl ];
+  configureFlags = [
+    "--with-ssl=${openssl.dev}"
+    "--sysconfdir=/etc"
+    "--localstatedir=/var"
+  ];
+
+  postInstall = ''
+    # remove legacy compatibility-wrapper that would require perl
+    rm $out/bin/stunnel3
+  '';
+
+  installFlags = [
+    "sysconfdir=\${out}/etc"
+    "localstatedir=\${TMPDIR}"
+  ];
+
+  meta = {
+    description = "Universal tls/ssl wrapper";
+    homepage    = "https://www.stunnel.org/";
+    license     = lib.licenses.gpl2Plus;
+    platforms   = lib.platforms.unix;
+    maintainers = [ lib.maintainers.thoughtpolice ];
+  };
+}