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/python-modules/pygtail/default.nix

@@ -0,0 +1,25 @@
+{ lib, buildPythonPackage, fetchFromGitHub }:
+
+buildPythonPackage rec {
+  pname = "pygtail";
+  version = "0.8.0";
+
+  src = fetchFromGitHub {
+    owner = "bgreenlee";
+    repo = pname;
+    rev = version;
+    sha256 = "1f8qlijiwn10jxg1bsi6q42fznbg8rw039yaxfh6rzbaj2gaxbz1";
+  };
+
+  # remove at next bump, tag is one commit early for 0.8.0
+  postPatch = ''
+    substituteInPlace pygtail/core.py \
+      --replace 0.7.0 0.8.0
+  '';
+
+  meta = with lib; {
+    description = "A library for reading log file lines that have not been read";
+    license = licenses.gpl2Plus;
+    homepage = "https://github.com/bgreenlee/pygtail";
+  };
+}