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/chroma/default.nix

@@ -0,0 +1,37 @@
+{ lib, buildGoModule, fetchFromGitHub }:
+
+let
+  srcInfo = lib.importJSON ./src.json;
+in
+
+buildGoModule rec {
+  pname = "chroma";
+  version = "0.10.0";
+
+  # To update:
+  # nix-prefetch-git --rev v${version} https://github.com/alecthomas/chroma.git > src.json
+  src = fetchFromGitHub {
+    owner  = "alecthomas";
+    repo   = pname;
+    rev    = "v${version}";
+    inherit (srcInfo) sha256;
+  };
+
+  vendorSha256 = "09b718vjd6npg850fr7z6srs2sc5vsr7byzlz5yb5qx0vm3ajxpf";
+
+  modRoot = "./cmd/chroma";
+
+  # substitute version info as done in goreleaser builds
+  ldflags = [
+    "-X" "main.version=${version}"
+    "-X" "main.commit=${srcInfo.rev}"
+    "-X" "main.date=${srcInfo.date}"
+  ];
+
+  meta = with lib; {
+    homepage = "https://github.com/alecthomas/chroma";
+    description = "A general purpose syntax highlighter in pure Go";
+    license = licenses.mit;
+    maintainers = [ maintainers.sternenseemann ];
+  };
+}