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/unbound/python.nix

@@ -0,0 +1,70 @@
+{ lib, stdenv, unbound, openssl, expat, libevent, swig, pythonPackages }:
+
+let
+  inherit (pythonPackages) python;
+in
+stdenv.mkDerivation rec {
+  pname = "pyunbound";
+  inherit (unbound) version src;
+
+  nativeBuildInputs = [ swig ];
+
+  buildInputs = [ openssl expat libevent python ];
+
+  postPatch = ''
+    substituteInPlace Makefile.in \
+      --replace "\$(DESTDIR)\$(PYTHON_SITE_PKG)" "$out/${python.sitePackages}" \
+      --replace "\$(LIBTOOL) --mode=install cp _unbound.la" "cp _unbound.la"
+  '';
+
+  preConfigure = "export PYTHON_VERSION=${python.pythonVersion}";
+
+  configureFlags = [
+    "--with-ssl=${openssl.dev}"
+    "--with-libexpat=${expat.dev}"
+    "--with-libevent=${libevent.dev}"
+    "--localstatedir=/var"
+    "--sysconfdir=/etc"
+    "--sbindir=\${out}/bin"
+    "--enable-pie"
+    "--enable-relro-now"
+    "--with-pyunbound"
+    "DESTDIR=$out"
+    "PREFIX="
+  ];
+
+  preInstall = ''
+    mkdir -p $out/${python.sitePackages} $out/etc/${pname}
+    cp .libs/_unbound.so .libs/libunbound.so* $out/${python.sitePackages}
+    substituteInPlace _unbound.la \
+      --replace "-L.libs $PWD/libunbound.la" "-L$out/${python.sitePackages}"
+  '';
+
+  installFlags = [
+    "configfile=\${out}/etc/unbound/unbound.conf"
+    "pyunbound-install"
+    "lib"
+  ];
+
+  # All we want is the Unbound Python module
+  postInstall = ''
+    # Generate the built in root anchor and root key and store these in a logical place
+    # to be used by tools depending only on the Python module
+    $out/bin/unbound-anchor -l | head -1 > $out/etc/${pname}/root.anchor
+    $out/bin/unbound-anchor -l | tail --lines=+2 - > $out/etc/${pname}/root.key
+    # We don't need anything else
+    rm -r $out/bin $out/share $out/include $out/etc/unbound
+  ''
+  # patchelf is only available on Linux and no patching is needed on darwin
+  + lib.optionalString stdenv.isLinux ''
+    patchelf --replace-needed libunbound.so.8 $out/${python.sitePackages}/libunbound.so.8 $out/${python.sitePackages}/_unbound.so
+  '';
+
+  meta = with lib; {
+    description = "Python library for Unbound, the validating, recursive, and caching DNS resolver";
+    license = licenses.bsd3;
+    homepage = "https://www.unbound.net";
+    maintainers = with maintainers; [ leenaars ];
+    platforms = platforms.unix;
+  };
+}