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/applications/networking/mailreaders/mmh/default.nix

@@ -0,0 +1,29 @@
+{ lib, stdenv, fetchurl, fetchpatch, ncurses, autoreconfHook, flex }:
+let rev = "b17ea39dc17e5514f33b3f5c34ede92bd16e208c";
+in stdenv.mkDerivation rec {
+  pname = "mmh";
+  version = "unstable-2020-08-21";
+
+  src = fetchurl {
+    url = "http://git.marmaro.de/?p=mmh;a=snapshot;h=${rev};sf=tgz";
+    name = "mmh-${rev}.tgz";
+    sha256 = "1bqfxafw4l2y46pnsxgy4ji1xlyifzw01k1ykbsjj9p61q3nv6l6";
+  };
+
+  postPatch = ''
+    substituteInPlace sbr/Makefile.in \
+      --replace "ar " "${stdenv.cc.targetPrefix}ar "
+ '';
+
+  buildInputs = [ ncurses ];
+  nativeBuildInputs = [ autoreconfHook flex ];
+
+  meta = with lib; {
+    description = "Set of electronic mail handling programs";
+    homepage = "http://marmaro.de/prog/mmh";
+    license = licenses.bsd3;
+    platforms = platforms.unix;
+    broken = stdenv.isDarwin;
+    maintainers = with maintainers; [ kaction ];
+  };
+}