* tools/gpgtar.c: New option --with-log.
* tools/gpgtar.h (opt): Add field with_log.
* tools/gpgtar-extract.c (gpgtar_extract): Move directory string
building up.  Add option --log-file if needed.
* tools/gpgtar-create.c (gpgtar_create): Make tmpbuf static becuase it
is used outside of its scope.
* tools/gpgtar-list.c (gpgtar_list): Ditto.