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/ydiff/default.nix

@@ -0,0 +1,48 @@
+{ lib, buildPythonPackage, fetchPypi, docutils, pygments
+, gitMinimal, mercurial, subversion, patchutils, less
+}:
+
+buildPythonPackage rec {
+  pname = "ydiff";
+  version = "1.2";
+
+  src = fetchPypi {
+    inherit pname version;
+    sha256 = "f5430577ecd30974d766ee9b8333e06dc76a947b4aae36d39612a0787865a121";
+  };
+
+  patchPhase = ''
+    substituteInPlace ydiff.py \
+      --replace "['git'" "['${gitMinimal}/bin/git'" \
+      --replace "['hg'" "['${mercurial}/bin/hg'" \
+      --replace "['svn'" "['${subversion}/bin/svn'" \
+      --replace "['filterdiff'" "['${patchutils}/bin/filterdiff'" \
+      --replace "['less'" "['${less}/bin/less'" # doesn't support PAGER from env
+    substituteInPlace tests/test_ydiff.py \
+      --replace /bin/rm rm \
+      --replace /bin/sh sh
+    patchShebangs setup.py
+    patchShebangs tests/*.sh
+  '';
+
+  checkInputs = [ docutils pygments ];
+
+  checkPhase = ''
+    runHook preCheck
+    make doc-check reg # We don't want the linter or coverage check.
+    runHook postCheck
+  '';
+
+  meta = with lib; {
+    description = "View colored, incremental diff in workspace or from stdin with side by side and auto pager support (Was \"cdiff\")";
+    longDescription = ''
+      Term based tool to view colored, incremental diff in a version
+      controlled workspace (supports Git, Mercurial, Perforce and Svn
+      so far) or from stdin, with side by side (similar to diff -y)
+      and auto pager support.
+    '';
+    homepage = "https://github.com/ymattw/ydiff";
+    license = licenses.bsd3;
+    maintainers = (with maintainers; [ leenaars ]) ++ teams.deshaw.members;
+  };
+}