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/filesystems/rar2fs/default.nix

@@ -0,0 +1,39 @@
+{ lib, stdenv
+, fetchFromGitHub
+, autoreconfHook
+, fuse
+, unrar
+}:
+
+stdenv.mkDerivation rec {
+  pname = "rar2fs";
+  version = "1.29.5";
+
+  src = fetchFromGitHub {
+    owner = "hasse69";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "sha256-x3QBnnwt9pXT0egOJ2rnUcZP99y9eVcw3rNTkdH2LYs=";
+  };
+
+  postPatch = ''
+    substituteInPlace get-version.sh \
+      --replace "which echo" "echo"
+  '';
+
+  nativeBuildInputs = [ autoreconfHook ];
+  buildInputs = [ fuse unrar ];
+
+  configureFlags = [
+    "--with-unrar=${unrar.dev}/include/unrar"
+    "--disable-static-unrar"
+  ];
+
+  meta = with lib; {
+    description = "FUSE file system for reading RAR archives";
+    homepage = "https://hasse69.github.io/rar2fs/";
+    license = licenses.gpl3Plus;
+    maintainers = with maintainers; [ kraem ];
+    platforms = with platforms; linux ++ freebsd;
+  };
+}