tests: Add test for gpgv.
* tests/openpgp/Makefile.am (XTESTS): Add the new test. * tests/openpgp/gpgv.scm: New file. * tests/openpgp/signed-messages.scm: Likewise. * tests/openpgp/verify.scm: Move the signed messages to the new file and load it.
- Signed-off-by: Justus Winter <justus@g10code.com>