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/interpreters/s9fes/default.nix

@@ -0,0 +1,35 @@
+{ stdenv, lib, fetchurl, ncurses, buildPackages }:
+
+let
+  isCrossCompiling = stdenv.hostPlatform != stdenv.buildPlatform;
+in
+
+stdenv.mkDerivation rec {
+  pname = "s9fes";
+  version = "20181205";
+
+  src = fetchurl {
+    url = "https://www.t3x.org/s9fes/s9fes-${version}.tgz";
+    sha256 = "sha256-Lp/akaDy3q4FmIE6x0fj9ae/SOD7tdsmzy2xdcCh13o=";
+  };
+
+  # Fix cross-compilation
+  postPatch = ''
+    substituteInPlace Makefile \
+      --replace 'ar q' '${stdenv.cc.targetPrefix}ar q' \
+      --replace 'strip' '${stdenv.cc.targetPrefix}strip'
+    ${lib.optionalString isCrossCompiling "substituteInPlace Makefile --replace ./s9 '${buildPackages.s9fes}/bin/s9'"}
+  '';
+
+  buildInputs = [ ncurses ];
+  makeFlags = [ "CC=${stdenv.cc.targetPrefix}cc" "PREFIX=$(out)" ];
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    description = "Scheme 9 From Empty Space, an interpreter for R4RS Scheme";
+    homepage = "http://www.t3x.org/s9fes/index.html";
+    license = licenses.publicDomain;
+    maintainers = with maintainers; [ siraben ];
+    platforms = platforms.unix;
+  };
+}