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/duktape/default.nix

@@ -0,0 +1,44 @@
+{ lib, stdenv, fetchurl, validatePkgConfig }:
+
+stdenv.mkDerivation rec {
+  pname = "duktape";
+  version = "2.7.0";
+  src = fetchurl {
+    url = "http://duktape.org/duktape-${version}.tar.xz";
+    sha256 = "sha256-kPjS+otVZ8aJmDDd7ywD88J5YLEayiIvoXqnrGE8KJA=";
+  };
+
+  nativeBuildInputs = [ validatePkgConfig ];
+
+  postPatch = ''
+    substituteInPlace Makefile.sharedlibrary \
+      --replace 'gcc' '${stdenv.cc.targetPrefix}cc' \
+      --replace 'g++' '${stdenv.cc.targetPrefix}c++'
+    substituteInPlace Makefile.cmdline \
+      --replace 'gcc' '${stdenv.cc.targetPrefix}cc' \
+      --replace 'g++' '${stdenv.cc.targetPrefix}c++'
+  '';
+  buildPhase = ''
+    make -f Makefile.sharedlibrary
+    make -f Makefile.cmdline
+  '';
+  installPhase = ''
+    install -d $out/bin
+    install -m755 duk $out/bin/
+    install -d $out/lib/pkgconfig
+    install -d $out/include
+    make -f Makefile.sharedlibrary install INSTALL_PREFIX=$out
+    substituteAll ${./duktape.pc.in} $out/lib/pkgconfig/duktape.pc
+  '';
+  enableParallelBuilding = true;
+
+  meta = with lib; {
+    description = "An embeddable Javascript engine, with a focus on portability and compact footprint";
+    homepage = "https://duktape.org/";
+    downloadPage = "https://duktape.org/download.html";
+    license = licenses.mit;
+    maintainers = [ maintainers.fgaz ];
+    mainProgram = "duk";
+    platforms = platforms.all;
+  };
+}

pkgs/development/interpreters/duktape/duktape.pc.in

@@ -0,0 +1,10 @@
+prefix=@out@
+exec_prefix=${prefix}
+libdir=${exec_prefix}/lib
+includedir=${prefix}/include
+
+Name: duktape
+Description: An embeddable Javascript engine, with a focus on portability and compact footprint
+Version: @version@
+Libs: -L${libdir} -lduktape
+Cflags: -I${includedir}