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/tools/build-managers/build2/bootstrap.nix

@@ -0,0 +1,44 @@
+{ lib, stdenv
+, fetchurl
+, pkgs
+, fixDarwinDylibNames
+}:
+stdenv.mkDerivation rec {
+  pname = "build2-bootstrap";
+  version = "0.14.0";
+  src = fetchurl {
+    url = "https://download.build2.org/${version}/build2-toolchain-${version}.tar.xz";
+    sha256 = "sha256-GO/GstQUmPdRbnqKXJECP2GCyGfUI3kjmDkN0MAEz90=";
+  };
+  patches = [
+    # Pick up sysdirs from NIX_LDFLAGS
+    ./nix-ldflags-sysdirs.patch
+  ];
+
+  sourceRoot = "build2-toolchain-${version}/build2";
+  makefile = "bootstrap.gmake";
+  enableParallelBuilding = true;
+
+  setupHook = ./setup-hook.sh;
+
+  strictDeps = true;
+
+  propagatedBuildInputs = lib.optionals stdenv.targetPlatform.isDarwin [
+    fixDarwinDylibNames
+  ];
+
+  doCheck = true;
+  checkPhase = ''
+    runHook preCheck
+    build2/b-boot --version
+    runHook postCheck
+  '';
+
+  installPhase = ''
+    runHook preInstall
+    install -D build2/b-boot $out/bin/b
+    runHook postInstall
+  '';
+
+  inherit (pkgs.build2) passthru;
+}