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/tools/text/difftastic/default.nix

@@ -0,0 +1,55 @@
+{ lib
+, fetchFromGitHub
+, fetchpatch
+, rustPlatform
+, tree-sitter
+, difftastic
+, testers
+}:
+
+rustPlatform.buildRustPackage rec {
+  pname = "difftastic";
+  version = "0.28.0";
+
+  src = fetchFromGitHub {
+    owner = "wilfred";
+    repo = pname;
+    rev = version;
+    sha256 = "sha256-krY1NbFilUHn6ePMRX4+EddsIu33Y7W8Wt5bIeB6wRE=";
+  };
+
+  depsExtraArgs = {
+    postBuild = let
+      mimallocPatch = (fetchpatch {
+        name = "mimalloc-older-macos-fixes.patch";
+        url = "https://github.com/microsoft/mimalloc/commit/40e0507a5959ee218f308d33aec212c3ebeef3bb.patch";
+        stripLen = 1;
+        extraPrefix = "libmimalloc-sys/c_src/mimalloc/";
+        sha256 = "1cqgay6ayzxsj8v1dy8405kwd8av34m4bjc84iyg9r52amlijbg4";
+      });
+    in ''
+      pushd $name
+      patch -p1 < ${mimallocPatch}
+      substituteInPlace libmimalloc-sys/.cargo-checksum.json \
+        --replace \
+          '6a2e9f0db0d3de160f9f15ddc8a870dbc42bba724f19f1e69b8c4952cb36821a' \
+          '201ab8874d9ba863406e084888e492b785a7edae00a222f395c079028d21a89a' \
+        --replace \
+          'a87a27e8432a63e5de25703ff5025588afd458e3a573e51b3c3dee2281bff0d4' \
+          'ab98a2da81d2145003a9cba7b7025efbd2c7b37c7a23c058c150705a3ec39298'
+      popd
+    '';
+  };
+  cargoSha256 = "sha256-nE6sl8n12fHLWH/tEXZhDjVBxGDoLyFDtVC5GFNClzM=";
+
+  passthru.tests.version = testers.testVersion { package = difftastic; };
+
+  meta = with lib; {
+    description = "A syntax-aware diff";
+    homepage = "https://github.com/Wilfred/difftastic";
+    changelog = "https://github.com/Wilfred/difftastic/raw/${version}/CHANGELOG.md";
+    license = licenses.mit;
+    maintainers = with maintainers; [ ethancedwards8 figsoda ];
+    mainProgram = "difft";
+  };
+}