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/libraries/libiconv/default.nix

@@ -0,0 +1,60 @@
+{ fetchurl, stdenv, lib
+, enableStatic ? stdenv.hostPlatform.isStatic
+, enableShared ? !stdenv.hostPlatform.isStatic
+}:
+
+# assert !stdenv.hostPlatform.isLinux || stdenv.hostPlatform != stdenv.buildPlatform; # TODO: improve on cross
+
+stdenv.mkDerivation rec {
+  pname = "libiconv";
+  version = "1.16";
+
+  src = fetchurl {
+    url = "mirror://gnu/libiconv/${pname}-${version}.tar.gz";
+    sha256 = "016c57srqr0bza5fxjxfrx6aqxkqy0s3gkhcg7p7fhk5i6sv38g6";
+  };
+
+  enableParallelBuilding = true;
+
+  setupHooks = [
+    ../../../build-support/setup-hooks/role.bash
+    ./setup-hook.sh
+  ];
+
+  postPatch =
+    lib.optionalString ((stdenv.hostPlatform != stdenv.buildPlatform && stdenv.hostPlatform.libc == "msvcrt") || stdenv.cc.nativeLibc)
+      ''
+        sed '/^_GL_WARN_ON_USE (gets/d' -i srclib/stdio.in.h
+      ''
+    + lib.optionalString (!enableShared) ''
+      sed -i -e '/preload/d' Makefile.in
+    '';
+
+  configureFlags = [
+    (lib.enableFeature enableStatic "static")
+    (lib.enableFeature enableShared "shared")
+  ] ++ lib.optional stdenv.isFreeBSD "--with-pic";
+
+  meta = {
+    description = "An iconv(3) implementation";
+
+    longDescription = ''
+      Some programs, like mailers and web browsers, must be able to convert
+      between a given text encoding and the user's encoding.  Other programs
+      internally store strings in Unicode, to facilitate internal processing,
+      and need to convert between internal string representation (Unicode)
+      and external string representation (a traditional encoding) when they
+      are doing I/O.  GNU libiconv is a conversion library for both kinds of
+      applications.
+    '';
+
+    homepage = "https://www.gnu.org/software/libiconv/";
+    license = lib.licenses.lgpl2Plus;
+
+    maintainers = [ ];
+    mainProgram = "iconv";
+
+    # This library is not needed on GNU platforms.
+    hydraPlatforms = with lib.platforms; cygwin ++ darwin ++ freebsd;
+  };
+}