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/development/compilers/mrustc/default.nix

@@ -0,0 +1,54 @@
+{ lib, stdenv
+, fetchFromGitHub
+, zlib
+}:
+
+let
+  version = "0.9";
+  tag = "v${version}";
+  rev = "15773561e40ca5c8cffe0a618c544b6cfdc5ad7e";
+in
+
+stdenv.mkDerivation rec {
+  pname = "mrustc";
+  inherit version;
+
+  # Always update minicargo.nix and bootstrap.nix in lockstep with this
+  src = fetchFromGitHub {
+    owner = "thepowersgang";
+    repo = "mrustc";
+    rev = tag;
+    sha256 = "194ny7vsks5ygiw7d8yxjmp1qwigd71ilchis6xjl6bb2sj97rd2";
+  };
+
+  postPatch = ''
+    sed -i 's/\$(shell git show --pretty=%H -s)/${rev}/' Makefile
+    sed -i 's/\$(shell git symbolic-ref -q --short HEAD || git describe --tags --exact-match)/${tag}/' Makefile
+    sed -i 's/\$(shell git diff-index --quiet HEAD; echo $$?)/0/' Makefile
+    sed '1i#include <limits>' -i src/trans/codegen_c.cpp
+  '';
+
+  strictDeps = true;
+  buildInputs = [ zlib ];
+  enableParallelBuilding = true;
+
+  installPhase = ''
+    runHook preInstall
+    mkdir -p $out/bin
+    cp bin/mrustc $out/bin
+    runHook postInstall
+  '';
+
+  meta = with lib; {
+    description = "Mutabah's Rust Compiler";
+    longDescription = ''
+      In-progress alternative rust compiler, written in C++.
+      Capable of building a fully-working copy of rustc,
+      but not yet suitable for everyday use.
+    '';
+    inherit (src.meta) homepage;
+    license = licenses.mit;
+    maintainers = with maintainers; [ progval r-burns ];
+    platforms = [ "x86_64-linux" ];
+  };
+}