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/saldl/default.nix

@@ -0,0 +1,50 @@
+{ lib, stdenv
+, fetchFromGitHub
+, pkg-config
+, wafHook
+, python3
+, asciidoc
+, docbook_xml_dtd_45
+, docbook_xsl
+, libxml2
+, libxslt
+, curl
+, libevent
+}:
+
+stdenv.mkDerivation rec {
+  pname = "saldl";
+  version = "41";
+
+  src = fetchFromGitHub {
+    owner = pname;
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-PAX2MUyBWWU8kGkaeoCJteidgszh7ipwDJbrLXzVsn0=";
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    wafHook
+    python3
+    asciidoc
+    docbook_xml_dtd_45
+    docbook_xsl
+    libxml2
+    libxslt
+  ];
+
+  buildInputs = [ curl libevent ];
+
+  wafConfigureFlags = [ "--saldl-version ${version}" "--no-werror" ];
+
+  outputs = [ "out" "man" ];
+
+  meta = with lib; {
+    description = "CLI downloader optimized for speed and early preview";
+    homepage = "https://saldl.github.io";
+    license = licenses.agpl3;
+    maintainers = with maintainers; [ zowoq ];
+    platforms = platforms.all;
+  };
+}