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/xcbuild/toolchains.nix

@@ -0,0 +1,73 @@
+{ runCommand, toolchainName, fetchurl, stdenv
+, buildPackages, lib, writeText }:
+
+let
+
+  inherit (lib) getBin optionalString;
+  inherit (lib.generators) toPlist;
+
+  ToolchainInfo = {
+    Identifier = toolchainName;
+  };
+
+  # We could pull this out of developer_cmds but it adds an annoying
+  # loop if we want to bootstrap and this is just a tiny script so I'm
+  # not going to bother.
+  mkdep-darwin-src = fetchurl {
+    url        = "https://opensource.apple.com/source/developer_cmds/developer_cmds-63/mkdep/mkdep.sh";
+    sha256     = "0n4wpqfslfjs5zbys5yri8pfi2awyhlmknsf6laa5jzqbzq9x541";
+    executable = true;
+  };
+in
+
+runCommand "Toolchains" {} (''
+  toolchain=$out/XcodeDefault.xctoolchain
+  mkdir -p $toolchain
+
+  install -D ${writeText "ToolchainInfo.plist" (toPlist {} ToolchainInfo)} $toolchain/ToolchainInfo.plist
+
+  ln -s $toolchain $toolchain/usr
+
+  mkdir -p $toolchain/include
+  mkdir -p $toolchain/lib
+  mkdir -p $toolchain/libexec
+  mkdir -p $toolchain/share
+  mkdir -p $toolchain/bin
+
+  for bin in ${getBin stdenv.cc}/bin/*; do
+    ln -s $bin $toolchain/bin
+  done
+
+  for bin in ${getBin stdenv.cc.bintools.bintools}/bin/*; do
+    if ! [ -e "$toolchain/bin/$(basename $bin)" ]; then
+      ln -s $bin $toolchain/bin
+    fi
+  done
+
+  ln -s ${buildPackages.bison}/bin/yacc $toolchain/bin/yacc
+  ln -s ${buildPackages.bison}/bin/bison $toolchain/bin/bison
+  ln -s ${buildPackages.flex}/bin/flex $toolchain/bin/flex
+  ln -s ${buildPackages.flex}/bin/flex++ $toolchain/bin/flex++
+  ln -s $toolchain/bin/flex $toolchain/bin/lex
+
+  ln -s ${buildPackages.m4}/bin/m4 $toolchain/bin/m4
+  ln -s $toolchain/bin/m4 $toolchain/bin/gm4
+
+  ln -s ${buildPackages.unifdef}/bin/unifdef $toolchain/bin/unifdef
+  ln -s ${buildPackages.unifdef}/bin/unifdefall $toolchain/bin/unifdefall
+
+  ln -s ${buildPackages.gperf}/bin/gperf $toolchain/bin/gperf
+  ln -s ${buildPackages.indent}/bin/indent $toolchain/bin/indent
+  ln -s ${buildPackages.ctags}/bin/ctags $toolchain/bin/ctags
+'' + optionalString stdenv.isDarwin ''
+  for bin in ${getBin buildPackages.darwin.cctools}/bin/*; do
+    if ! [ -e "$toolchain/bin/$(basename $bin)" ]; then
+      ln -s $bin $toolchain/bin
+    fi
+  done
+
+  ln -s ${buildPackages.darwin.bootstrap_cmds}/bin/mig $toolchain/bin
+  mkdir -p $toolchain/libexec
+  ln -s ${buildPackages.darwin.bootstrap_cmds}/libexec/migcom $toolchain/libexec
+  ln -s ${mkdep-darwin-src} $toolchain/bin/mkdep
+'')