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/libassuan/default.nix

@@ -0,0 +1,42 @@
+{ fetchurl, lib, stdenv, gettext, npth, libgpg-error, buildPackages }:
+
+stdenv.mkDerivation rec {
+  pname = "libassuan";
+  version = "2.5.5";
+
+  src = fetchurl {
+    url = "mirror://gnupg/${pname}/${pname}-${version}.tar.bz2";
+    sha256 = "sha256-jowvzJgvnKZ9y7HZXi3HRrFzmkZovCCzo8W+Yy7bNOQ=";
+  };
+
+  outputs = [ "out" "dev" "info" ];
+  outputBin = "dev"; # libassuan-config
+
+  depsBuildBuild = [ buildPackages.stdenv.cc ];
+  buildInputs = [ npth gettext ];
+
+  configureFlags = [
+    "--with-libgpg-error-prefix=${libgpg-error.dev}"
+  ];
+
+  doCheck = true;
+
+  # Make sure includes are fixed for callers who don't use libassuan-config
+  postInstall = ''
+    sed -i 's,#include <gpg-error.h>,#include "${libgpg-error.dev}/include/gpg-error.h",g' $dev/include/assuan.h
+  '';
+
+  meta = with lib; {
+    description = "IPC library used by GnuPG and related software";
+    longDescription = ''
+      Libassuan is a small library implementing the so-called Assuan
+      protocol.  This protocol is used for IPC between most newer
+      GnuPG components.  Both, server and client side functions are
+      provided.
+    '';
+    homepage = "http://gnupg.org";
+    license = licenses.lgpl2Plus;
+    platforms = platforms.all;
+    maintainers = [ maintainers.erictapen ];
+  };
+}