cipher:dilithium: Add dilithium functions for libgcrypt internal use.
* cipher/dilithium.c (dilithium_keypair, dilithium_sign) (dilithium_verify): New. * cipher/dilithium.h: Likewise.
- GnuPG-bug-id: T7640
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>