WatchOS new architecture.

[amirrajan]

maybe this will fix it:

Starting at line 355 in lib/motion/project/template/ios-extension-builder.rb:

  # Use the `-no_implicit_dylibs` linker option to hide the fact that it
  # links against `libextension.dylib` which contains `NSExtensionMain`.
sh "#{cxx} -o \"#{main_exec}\" #{entitlements} #{objs_list}  -fobjc-link-runtime -fapplication-extension -Xlinker -no_implicit_dylibs #{config.ldflags(platform)} -L\"#{File.join(datadir, platform)}\" -lrubymotion-static -lobjc -licucore #{linker_option} #{framework_search_paths} #{frameworks} #{weak_frameworks} #{config.libs.join(' ')} #{vendor_libs}"

  if platform == "WatchOS" &&
     Util::Version.new(config.deployment_target) >= Util::Version.new("5.0")
    App.info "Patch", relative_path(main_exec)

    bitcode_build_tool = File.join(config.xcode_dir, '/usr/bin/bitcode-build-tool')
    if File.exists? bitcode_build_tool
      arm64_32_exec = "#{main_exec}.arm64_32"
      armv7k_exec = "#{main_exec}.armv7k"

      FileUtils.mv(main_exec, armv7k_exec)

      sh "#{bitcode_build_tool} --translate-watchos -o \"#{arm64_32_exec}\" \"#{armv7k_exec}\" > /dev/null"
      sh "/usr/bin/lipo -create \"#{arm64_32_exec}\" \"#{armv7k_exec}\" -output \"#{main_exec}\""

      FileUtils.rm armv7k_exec
      FileUtils.rm arm64_32_exec
    else
      App.warn "Cannot add arm64_32 support for the Watch app extension required for AppStore distribution"
    end
  end

  main_exec_created = true