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/os-specific/darwin/apple-source-releases/libiconv/default.nix

@@ -0,0 +1,37 @@
+{ stdenv, appleDerivation, lib
+, enableStatic ? stdenv.hostPlatform.isStatic
+, enableShared ? !stdenv.hostPlatform.isStatic
+}:
+
+appleDerivation {
+  postUnpack = "sourceRoot=$sourceRoot/libiconv";
+
+  preConfigure = lib.optionalString stdenv.hostPlatform.isiOS ''
+    sed -i 's/darwin\*/ios\*/g' configure libcharset/configure
+  '';
+
+  configureFlags = [
+    (lib.enableFeature enableStatic "static")
+    (lib.enableFeature enableShared "shared")
+  ];
+
+  postInstall = lib.optionalString enableShared ''
+    mv $out/lib/libiconv.dylib $out/lib/libiconv-nocharset.dylib
+    ${stdenv.cc.bintools.targetPrefix}install_name_tool -id $out/lib/libiconv-nocharset.dylib $out/lib/libiconv-nocharset.dylib
+
+    # re-export one useless symbol; ld will reject a dylib that only reexports other dylibs
+    echo 'void dont_use_this(){}' | ${stdenv.cc.bintools.targetPrefix}clang -dynamiclib -x c - -current_version 2.4.0 \
+      -compatibility_version 7.0.0 -current_version 7.0.0 -o $out/lib/libiconv.dylib \
+      -Wl,-reexport_library -Wl,$out/lib/libiconv-nocharset.dylib \
+      -Wl,-reexport_library -Wl,$out/lib/libcharset.dylib
+  '';
+
+  setupHooks = [
+    ../../../../build-support/setup-hooks/role.bash
+    ../../../../development/libraries/libiconv/setup-hook.sh
+  ];
+
+  meta = {
+    platforms = lib.platforms.darwin;
+  };
+}