Remove wxUSE_UNICODE checks as they're always true now

Also remove all code guarded by "#if !wxUSE_UNICODE".

samples/ipc/connection.h

@@ -38,11 +38,9 @@ protected:
               s += wxString(static_cast<const char *>(data), size);
               break;
 
-#if wxUSE_UNICODE
           case wxIPC_UNICODETEXT:
               s += wxString(static_cast<const wchar_t *>(data), size);
               break;
-#endif // wxUSE_UNICODE
 
           case wxIPC_UTF8TEXT:
               s += wxString::FromUTF8(static_cast<const char *>(data), size);