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/nix/cached-nix-shell/default.nix

@@ -0,0 +1,46 @@
+{ lib, fetchFromGitHub, nix, openssl, pkg-config, ronn, rustPlatform }:
+
+let
+  blake3-src = fetchFromGitHub {
+    owner = "BLAKE3-team";
+    repo = "BLAKE3";
+    rev = "0.3.3";
+    sha256 = "0av41ld0gqf3g60gcllpz59nqlr7r62v99mgfq9gs0p8diw5gi7x";
+  };
+
+in rustPlatform.buildRustPackage rec {
+  pname = "cached-nix-shell";
+  version = "0.1.5";
+
+  src = fetchFromGitHub {
+    owner = "xzfc";
+    repo = pname;
+    rev = "v${version}";
+    sha256 = "17v38llx83mp05a0axjxcd2zyafd57syh7xhx5cq6qibcbha0by9";
+  };
+
+  cargoSha256 = "1jkkwsn3k2anmzf99x99r9zfnf0gpcjbi5pyakh4agiryqcdyg0j";
+
+  # The BLAKE3 C library is intended to be built by the project depending on it
+  # rather than as a standalone library.
+  # https://github.com/BLAKE3-team/BLAKE3/blob/0.3.1/c/README.md#building
+  BLAKE3_CSRC = "${blake3-src}/c";
+
+  nativeBuildInputs = [ nix ronn ];
+
+  postBuild = ''
+    make -f nix/Makefile post-build
+  '';
+
+  postInstall = ''
+    make -f nix/Makefile post-install
+  '';
+
+  meta = with lib; {
+    description = "Instant startup time for nix-shell";
+    homepage = "https://github.com/xzfc/cached-nix-shell";
+    license = with licenses; [ unlicense /* or */ mit ];
+    maintainers = with maintainers; [ xzfc ];
+    platforms = platforms.linux;
+  };
+}