removing strange using

cpl_vsi_mem.cpp:966:53: error: too few arguments to function call, expected 3, have 2; did you mean 'VSIArchiveFilesystemHandler::Open'?
    return reinterpret_cast<VSILFILE *>( poHandler->Open( osFilename, "r+" ) );
                                                    ^~~~
                                                    VSIArchiveFilesystemHandler::Open
/Users/schwehr/src/gdal/gdal/port/cpl_vsi_virtual.h:89:23: note: 'VSIArchiveFilesystemHandler::Open' declared here
    VSIVirtualHandle *Open( const char *pszFilename,