gost: Rename tc26 s-box from A to Z.
* cipher/gost-s-box.c (gost_sboxes): Rename TC26_A to TC26_Z as it is the name that ended up in all standards.
Backport of master commit:dc8ceb8d2dfef949f3afa14fc75f9de8cd07c7ad
- Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@gmail.com>