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/jcal/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchFromGitHub, autoreconfHook
+, readline
+}:
+
+stdenv.mkDerivation rec {
+  pname = "jcal";
+  version = "0.4.1";
+
+  src = fetchFromGitHub {
+    owner = "fzerorubigd";
+    repo = "jcal";
+    rev = "v${version}";
+    sha256 = "0m3g3rf0ycv2dsfn9y2472fa3r0yla8pfqk6gq00nrscsc3pp4zf";
+  };
+
+  nativeBuildInputs = [ autoreconfHook ];
+  buildInputs = [ readline ];
+
+  preAutoreconf = "cd sources/";
+
+  meta = with lib; {
+    description = "Jalali calendar is a small and portable free software library to manipulate date and time in Jalali calendar system";
+    homepage =  "http://nongnu.org/jcal/";
+    license = licenses.gpl3;
+    maintainers = [ ];
+    platforms = platforms.all;
+  };
+}