tools/gpgtar: Implement symmetric encryption.
* tests/openpgp/gpgtar.test: Add test case. * tools/gpgtar-create.c (gpgtar_create): Pass '--symmetric' flag to gpg. * tools/gpgtar.c (parse_arguments): We do handle the argument now.
- Signed-off-by: Justus Winter <justus@g10code.com>