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/system/runit/default.nix

@@ -0,0 +1,61 @@
+{ lib, stdenv, fetchurl, darwin
+
+# Build runit-init as a static binary
+, static ? false
+}:
+
+stdenv.mkDerivation rec {
+  pname = "runit";
+  version = "2.1.2";
+
+  src = fetchurl {
+    url = "http://smarden.org/runit/${pname}-${version}.tar.gz";
+    sha256 = "065s8w62r6chjjs6m9hapcagy33m75nlnxb69vg0f4ngn061dl3g";
+  };
+
+  patches = [
+    ./fix-ar-ranlib.patch
+  ];
+
+  outputs = [ "out" "man" ];
+
+  sourceRoot = "admin/${pname}-${version}";
+
+  doCheck = true;
+
+  buildInputs = lib.optionals static [ stdenv.cc.libc stdenv.cc.libc.static ] ++
+    lib.optional stdenv.isDarwin darwin.apple_sdk.libs.utmp;
+
+  postPatch = ''
+    sed -i "s,\(#define RUNIT\) .*,\1 \"$out/bin/runit\"," src/runit.h
+    # usernamespace sandbox of nix seems to conflict with runit's assumptions
+    # about unix users. Therefor skip the check
+    sed -i '/.\/chkshsgr/d' src/Makefile
+  '' + lib.optionalString (!static) ''
+    sed -i 's,-static,,g' src/Makefile
+  '';
+
+  preBuild = ''
+    cd src
+
+    # Both of these are originally hard-coded to gcc
+    echo ${stdenv.cc.targetPrefix}cc > conf-cc
+    echo ${stdenv.cc.targetPrefix}cc ${lib.optionalString stdenv.isDarwin "-Xlinker -x "}> conf-ld
+  '';
+
+  installPhase = ''
+    mkdir -p $out/bin
+    cp -t $out/bin $(< ../package/commands)
+
+    mkdir -p $man/share/man
+    cp -r ../man $man/share/man/man8
+  '';
+
+  meta = with lib; {
+    description = "UNIX init scheme with service supervision";
+    license = licenses.bsd3;
+    homepage = "http://smarden.org/runit";
+    maintainers = with maintainers; [ joachifm ];
+    platforms = platforms.linux ++ platforms.darwin;
+  };
+}