Xcode 10.0 update problem of wxWidgets (g++)

ld: warning: /System/Library/Frameworks//...

try dylib to TBD files：

https://github.com/EOSIO/eos/issues/5418
and
http://sd.jtimothyking.com/2018/07/26/stub-file-and-library-file-out-of-sync/

if the problem remains unsolved：

1. sudo mv /Library/Developer/CommandLineTools /Library/Developer/CommandLineTools.old
2. sudo rm -rf /Library/Developer/CommandLineTools.old
3. Download Command Line Tools from AppleDeveloper ：https://developer.apple.com/download/more/
4. Double Click *.dmg (e.g. Command_Line_Tools_macOS_10.13_for_Xcode_9.2.dmg) install
5. Rebuild your wxWidgets project with g++