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/development/libraries/tevent/default.nix

@@ -0,0 +1,52 @@
+{ lib, stdenv
+, fetchurl
+, python3
+, pkg-config
+, readline
+, talloc
+, libxslt
+, docbook-xsl-nons
+, docbook_xml_dtd_42
+, which
+, wafHook
+}:
+
+stdenv.mkDerivation rec {
+  pname = "tevent";
+  version = "0.10.2";
+
+  src = fetchurl {
+    url = "mirror://samba/tevent/${pname}-${version}.tar.gz";
+    sha256 = "15k6i8ad5lpxfjsjyq9h64zlyws8d3cm0vwdnaw8z1xjwli7hhpq";
+  };
+
+  nativeBuildInputs = [
+    pkg-config
+    which
+    python3
+    libxslt
+    docbook-xsl-nons
+    docbook_xml_dtd_42
+    wafHook
+  ];
+
+  buildInputs = [
+    python3
+    readline # required to build python
+    talloc
+  ];
+
+  wafPath = "buildtools/bin/waf";
+
+  wafConfigureFlags = [
+    "--bundled-libraries=NONE"
+    "--builtin-libraries=replace"
+  ];
+
+  meta = with lib; {
+    description = "An event system based on the talloc memory management library";
+    homepage = "https://tevent.samba.org/";
+    license = licenses.lgpl3Plus;
+    platforms = platforms.all;
+  };
+}