Xcode 11.4.1下添加 libstdc++.6.0.9.

（ios13.5）xcode11.4.1模拟器需要的tbd： libstdc++.6.0.9.tbd 路径：/Contents/Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator.sdk/usr/lib/

（ios13.5）xcode11.4.1真机需要的tbd： libstdc++.6.0.9.tbd 路径：/Contents/Developer/Platforms/iPhoneOS.platform/Developer/SDKs/iPhoneOS.sdk/usr/lib/

 （ios13.5）xcode11.4.1 模拟器：/用户Contents/Developer/Platforms/iPhoneOS.platform/Library/Developer/CoreSimulator/Profiles/Runtimes/iOS.simruntime/Contents/Resources/RuntimeRoot/usr/lib