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/libspectre/default.nix

@@ -0,0 +1,34 @@
+{ fetchurl, lib, stdenv, pkg-config, ghostscript, cairo }:
+
+stdenv.mkDerivation rec {
+  pname = "libspectre";
+  version = "0.2.7";
+
+  src = fetchurl {
+    url = "https://libspectre.freedesktop.org/releases/${pname}-${version}.tar.gz";
+    sha256 = "1v63lqc6bhhxwkpa43qmz8phqs8ci4dhzizyy16d3vkb20m846z8";
+  };
+
+  patches = [ ./libspectre-0.2.7-gs918.patch ];
+
+  buildInputs = [
+    # Need `libgs.so'.
+    pkg-config ghostscript cairo /*for tests*/
+  ];
+
+  doCheck = true;
+
+  meta = {
+    homepage = "http://libspectre.freedesktop.org/";
+    description = "PostScript rendering library";
+
+    longDescription = ''
+      libspectre is a small library for rendering Postscript
+      documents.  It provides a convenient easy to use API for
+      handling and rendering Postscript documents.
+    '';
+
+    license = lib.licenses.gpl2Plus;
+    platforms = lib.platforms.unix;
+  };
+}