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/varnish/modules.nix

@@ -0,0 +1,48 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook, pkg-config, varnish, docutils, removeReferencesTo }:
+let
+  common = { version, sha256, extraNativeBuildInputs ? [] }:
+    stdenv.mkDerivation rec {
+      pname = "${varnish.name}-modules";
+      inherit version;
+
+      src = fetchFromGitHub {
+        owner = "varnish";
+        repo = "varnish-modules";
+        rev = version;
+        inherit sha256;
+      };
+
+      nativeBuildInputs = [
+        autoreconfHook
+        docutils
+        pkg-config
+        removeReferencesTo
+        varnish.python  # use same python version as varnish server
+      ];
+
+      buildInputs = [ varnish ];
+
+      postPatch = ''
+        substituteInPlace bootstrap   --replace "''${dataroot}/aclocal"                  "${varnish.dev}/share/aclocal"
+        substituteInPlace Makefile.am --replace "''${LIBVARNISHAPI_DATAROOTDIR}/aclocal" "${varnish.dev}/share/aclocal"
+      '';
+
+      postInstall = "find $out -type f -exec remove-references-to -t ${varnish.dev} '{}' +"; # varnish.dev captured only as __FILE__ in assert messages
+
+      meta = with lib; {
+        description = "Collection of Varnish Cache modules (vmods) by Varnish Software";
+        homepage = "https://github.com/varnish/varnish-modules";
+        inherit (varnish.meta) license platforms maintainers;
+      };
+    };
+in
+{
+  modules15 = common {
+    version = "0.15.1";
+    sha256 = "1lwgjhgr5yw0d17kbqwlaj5pkn70wvaqqjpa1i0n459nx5cf5pqj";
+  };
+  modules19 = common {
+    version = "0.19.0";
+    sha256 = "0qq5g6bbd1a1ml1wk8jj9z39a899jzqbf7aizr3pvyz0f4kz8mis";
+  };
+}