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/misc/rrdtool/default.nix

@@ -0,0 +1,31 @@
+{ fetchurl, lib, stdenv, gettext, perl, pkg-config, libxml2, pango, cairo, groff
+, tcl-8_5, darwin }:
+
+perl.pkgs.toPerlModule (stdenv.mkDerivation rec {
+  pname = "rrdtool";
+  version = "1.7.2";
+
+  src = fetchurl {
+    url = "https://oss.oetiker.ch/rrdtool/pub/rrdtool-${version}.tar.gz";
+    sha256 = "1nsqra0g2nja19akmf9x5y9hhgc35ml3w9dcdz2ayz7zgvmzm6d1";
+  };
+
+  nativeBuildInputs = [ pkg-config ];
+
+  buildInputs = [ gettext perl libxml2 pango cairo groff ]
+    ++ lib.optionals stdenv.isDarwin [ tcl-8_5 darwin.apple_sdk.frameworks.ApplicationServices ];
+
+  postInstall = ''
+    # for munin and rrdtool support
+    mkdir -p $out/${perl.libPrefix}
+    mv $out/lib/perl/5* $out/${perl.libPrefix}
+  '';
+
+  meta = with lib; {
+    homepage = "https://oss.oetiker.ch/rrdtool/";
+    description = "High performance logging in Round Robin Databases";
+    license = licenses.gpl2;
+    platforms = platforms.linux ++ platforms.darwin;
+    maintainers = with maintainers; [ pSub ];
+  };
+})