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/shocco/default.nix

@@ -0,0 +1,28 @@
+{ lib, stdenv, fetchFromGitHub, perlPackages, python3 }:
+
+stdenv.mkDerivation rec {
+  pname = "shocco";
+  version = "1.0";
+
+  src = fetchFromGitHub {
+    owner = "rtomayko";
+    repo = "shocco";
+    rev = version;
+    sha256 = "1nkwcw9fqf4vyrwidqi6by7nrmainkjqkirkz3yxmzk6kzwr38mi";
+  };
+
+  prePatch = ''
+    # Don't change $PATH
+    substituteInPlace configure --replace PATH= NIRVANA=
+  '';
+
+  buildInputs = [ perlPackages.TextMarkdown python3.pkgs.pygments ];
+
+  meta = with lib; {
+    description = "A quick-and-dirty, literate-programming-style documentation generator for / in POSIX shell";
+    homepage = "https://rtomayko.github.io/shocco/";
+    license = licenses.mit;
+    platforms = platforms.all;
+    maintainers = with maintainers; [ dotlambda ];
+  };
+}