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/networking/mpack/default.nix

@@ -0,0 +1,36 @@
+{ lib, stdenv, fetchurl }:
+
+stdenv.mkDerivation rec {
+  pname = "mpack";
+  version = "1.6";
+
+  src = fetchurl {
+    url = "http://ftp.andrew.cmu.edu/pub/mpack/mpack-${version}.tar.gz";
+    sha256 = "0k590z96509k96zxmhv72gkwhrlf55jkmyqlzi72m61r7axhhh97";
+  };
+
+  patches = [ ./build-fix.patch ./sendmail-via-execvp.diff ];
+
+  postPatch = ''
+    for f in *.{c,man,pl,unix} ; do
+      substituteInPlace $f --replace /usr/tmp /tmp
+    done
+
+    # this just shuts up some warnings
+    for f in {decode,encode,part,unixos,unixpk,unixunpk,xmalloc}.c ; do
+      sed -i 'i#include <stdlib.h>' $f
+    done
+  '';
+
+  postInstall = ''
+    install -Dm644 -t $out/share/doc/mpack INSTALL README.*
+  '';
+
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    description = "Utilities for encoding and decoding binary files in MIME";
+    license = licenses.free;
+    platforms = platforms.linux;
+  };
+}