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/os-specific/darwin/smimesign/default.nix

@@ -0,0 +1,25 @@
+{ buildGoModule, fetchFromGitHub, lib }:
+
+buildGoModule rec {
+  pname = "smimesign";
+  version = "0.1.0";
+
+  src = fetchFromGitHub {
+    owner = "github";
+    repo = "smimesign";
+    rev = "v${version}";
+    sha256 = "12f8vprp4v78l9ifrlql0mvpyw5qa8nlrh5ajq5js8wljzpx7wsv";
+  };
+
+  vendorSha256 = "1cldxykm9qj5rvyfafam45y5xj4f19700s2f9w7ndhxgfp9vahvz";
+
+  ldflags = [ "-X main.versionString=v${version}" ];
+
+  meta = with lib; {
+    description = "An S/MIME signing utility for macOS and Windows that is compatible with Git";
+    homepage = "https://github.com/github/smimesign";
+    license = licenses.mit;
+    platforms = platforms.darwin ++ platforms.windows;
+    maintainers = [ maintainers.enorris ];
+  };
+}