cipher,ecc: Fix for supplied K.
* cipher/ecc.c (ecc_sign): Check if it's under FIPS mode. (ecc_verify): Supplied K does no sense for verification, but add comment of clarification mark/reject-ing under FIPS mode.
- GnuPG-bug-id: T7338
- Signed-off-by: NIIBE Yutaka <gniibe@fsij.org>