message: Fix wxChoice baseline alignment on macOS 11+
diff: #define BORDER_MACOS(dir, n) Border(dir, 0)
  #endif
  +#ifdef __WXOSX__
  + inline int AboveCheckboxPadding()
  + {
  + if (__builtin_available(macOS 11.0, *))
  + return 4;
  + else
  + return 0;
  + }
  +#else
  + #define AboveCheckboxPadding() 0
  +#endif
  +
  // ----------------------------------------------------------------------
  // Platform version checks
  