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-commitsigs/default.nix

@@ -0,0 +1,41 @@
+{ lib
+, fetchhg
+, stdenv
+, python
+}:
+
+stdenv.mkDerivation rec {
+  pname = "hg-commitsigs";
+  # Latest tag is 11 years old.
+  version = "unstable-2021-01-08";
+
+  src = fetchhg {
+    url = "https://foss.heptapod.net/mercurial/commitsigs";
+    rev = "b53eb6862bff";
+    sha256 = "sha256-PS1OhC9MiVFD7WYlIn6FavD5TyhM50WoV6YagI2pLxU=";
+  };
+
+  # Not sure how the tests are supposed to be run, and they 10 years old...
+  doCheck = false;
+  dontBuild = true;
+
+  installPhase = ''
+    mkdir -p $out/lib/${python.libPrefix}/site-packages/hgext3rd/
+    install -D $src/commitsigs.py \
+               $out/lib/${python.libPrefix}/site-packages/hgext3rd/
+  '';
+
+  meta = with lib; {
+    description = "Automatic signing of changeset hashes";
+    longDescription = ''
+      This packages provides a Mercurial extension that lets you sign
+      the changeset hash when you commit.  The signature is embedded
+      directly in the changeset itself; there wont be any extra
+      commits.  Either GnuPG or OpenSSL can be used to sign the hashes.
+    '';
+    homepage = "https://foss.heptapod.net/mercurial/commitsigs";
+    maintainers = with maintainers; [ yoctocell ];
+    license = licenses.gpl2Plus;
+    platforms = platforms.unix; # same as Mercurial
+  };
+}