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/servers/mail/postfix/pfixtools.nix

@@ -0,0 +1,56 @@
+{ stdenv, lib, fetchFromGitHub, git, gperf, pcre, unbound, libev, tokyocabinet, pkg-config, bash, libsrs2 }:
+
+let
+  version = "0.9";
+
+  pfixtoolsSrc = fetchFromGitHub {
+    owner = "Fruneau";
+    repo = "pfixtools";
+    rev = "pfixtools-${version}";
+    sha256 = "1vmbrw686f41n6xfjphfshn96vl07ynvnsyjdw9yfn9bfnldcjcq";
+  };
+
+  srcRoot = pfixtoolsSrc.name;
+
+  libCommonSrc = fetchFromGitHub {
+    owner = "Fruneau";
+    repo = "libcommon";
+    rev = "b07e6bdea3d24748e0d39783d7d817096d10cc67";
+    sha256 = "14fxldp29j4vmfmhfgwwi37pj8cz0flm1aykkxlbgakz92d4pm35";
+  };
+
+in
+
+stdenv.mkDerivation {
+  pname = "pfixtools";
+  inherit version;
+
+  src = pfixtoolsSrc;
+
+  patches = [ ./0001-Fix-build-with-unbound-1.6.1.patch ];
+
+  nativeBuildInputs = [ pkg-config ];
+  buildInputs = [git gperf pcre unbound libev tokyocabinet bash libsrs2];
+
+  postUnpack = ''
+    cp -Rp ${libCommonSrc}/* ${srcRoot}/common;
+    chmod -R +w ${srcRoot}/common;
+  '';
+
+  postPatch = ''
+    substituteInPlace postlicyd/policy_tokens.sh \
+                      --replace /bin/bash ${bash}/bin/bash;
+  '';
+
+  NIX_CFLAGS_COMPILE = "-Wno-error=unused-result -Wno-error=nonnull-compare -Wno-error=format-truncation";
+
+  makeFlags = [ "DESTDIR=$(out)" "prefix=" ];
+
+  meta = {
+    description = "A collection of postfix-related tools";
+    license = with lib.licenses; [ bsd3 ];
+    homepage = "https://github.com/Fruneau/pfixtools";
+    platforms = lib.platforms.linux;
+    maintainers = with lib.maintainers; [ jerith666 ];
+  };
+}