* tools/gpgtar.c (oCompatibilityFlags): New.
(opts): Add "compatibility-flags".
(compatibility_flags): New.
(parse_arguments): Parse it.
* tools/gpgtar.h (opt): Add field compat_flags.
(COMPAT_NO_DIR_CHECK): New.
* tools/gpgtar-extract.c (gpgtar_extract): No directory check if
  COMPAT_NO_DIR_CHECK is set.