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/hg-evolve/default.nix

@@ -0,0 +1,59 @@
+{ lib
+, buildPythonPackage
+, fetchPypi
+, mercurial
+}:
+
+buildPythonPackage rec {
+  pname = "hg-evolve";
+  version = "10.5.1";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "sha256-JGk9PdCDXiDkP8Arw2pfpU+sEj/sCHwwHHWVwF3Ofzw=";
+  };
+
+  checkInputs = [
+    mercurial
+  ];
+
+  checkPhase = ''
+    runHook preCheck
+
+    export TESTTMP=$(mktemp -d)
+    export HOME=$TESTTMP
+    cat <<EOF >$HOME/.hgrc
+    [extensions]
+    evolve =
+    topic =
+    EOF
+
+    # Shipped tests use the mercurial testing framework, and produce inconsistent results.
+    # Do a quick smoke-test to see if things do what we expect.
+    hg init $TESTTMP/repo
+    pushd $TESTTMP/repo
+    touch a
+    hg add a
+    hg commit -m "init a"
+    hg topic something
+
+    touch b
+    hg add b
+    hg commit -m "init b"
+
+    echo hi > b
+    hg amend
+
+    hg obslog
+    popd
+
+    runHook postCheck
+  '';
+
+  meta = with lib; {
+    description = "Enables the “changeset evolution” feature of Mercurial core";
+    homepage = "https://www.mercurial-scm.org/doc/evolution/";
+    maintainers = with maintainers; [ xavierzwirtz lukegb ];
+    license = licenses.gpl2Plus;
+  };
+}