Update crypto code from Catacomb 2.5.0.

Update crypto code from Catacomb 2.5.0.

This change committed automatically by `catacomb-import-update'.

Detailed list of changes:
  Initial import of debian/copyright.
  Initial import of math/f25519.c.
  Initial import of math/f25519.h.
  Initial import of math/fgoldi.c.
  Initial import of math/fgoldi.h.
  Initial import of math/montladder.h.
  Initial import of math/qfarith.h.
  Initial import of math/scaf.c.
  Initial import of math/scaf.h.
  Initial import of math/scmul.h.
  Initial import of math/t/f25519.
  Initial import of math/t/fgoldi.
  Initial import of pub/ed25519.c.
  Initial import of pub/ed25519.h.
  Initial import of pub/ed448.c.
  Initial import of pub/ed448.h.
  Initial import of pub/t/ed25519.djb.
  Initial import of pub/t/ed25519.local.
  Initial import of pub/t/ed448.
  Initial import of pub/t/x25519.
  Initial import of pub/t/x25519.slow.
  Initial import of pub/t/x448.
  Initial import of pub/t/x448.slow.
  Initial import of pub/x25519.c.
  Initial import of pub/x25519.h.
  Initial import of pub/x448.c.
  Initial import of pub/x448.h.
  Updated secnet-import.auto.mk.
  Initial import of symm/keccak1600.c.
  Initial import of symm/keccak1600.h.
  Initial import of symm/sha3.c.
  Initial import of symm/sha3.h.
  Initial import of symm/t/SHA3_224LongMsg.rsp.
  Initial import of symm/t/SHA3_224Monte.rsp.
  Initial import of symm/t/SHA3_224ShortMsg.rsp.
  Initial import of symm/t/SHA3_256LongMsg.rsp.
  Initial import of symm/t/SHA3_256Monte.rsp.
  Initial import of symm/t/SHA3_256ShortMsg.rsp.
  Initial import of symm/t/SHA3_384LongMsg.rsp.
  Initial import of symm/t/SHA3_384Monte.rsp.
  Initial import of symm/t/SHA3_384ShortMsg.rsp.
  Initial import of symm/t/SHA3_512LongMsg.rsp.
  Initial import of symm/t/SHA3_512Monte.rsp.
  Initial import of symm/t/SHA3_512ShortMsg.rsp.
  Initial import of symm/t/SHAKE128LongMsg.rsp.
  Initial import of symm/t/SHAKE128ShortMsg.rsp.
  Initial import of symm/t/SHAKE128VariableOut.rsp.
  Initial import of symm/t/SHAKE256LongMsg.rsp.
  Initial import of symm/t/SHAKE256ShortMsg.rsp.
  Initial import of symm/t/SHAKE256VariableOut.rsp.
  Initial import of symm/t/keccak1600.
  Initial import of symm/t/sha3.local.

Upstream-Revision: ad7da99a043dab9addc7fce6b22b30f12c7676e6