Updated package to latest version, 1.11 (plus distribution change). Changes
include:

Release 1.11:
- Adapt to "safe string" mode (OCaml 4.02 and later required).
  The API should remain backward-compatible for clients compiled
  in "unsafe string" mode.
- Update SHA-3 to the official NIST standard (different padding than
  in the Keccak submission).  (Closes: #1528)
- Fixed bounds checking in "add_substring" methods of hash functions
  and other functions that operate on a substring of a string.
  (Closes: #1480)
- Use hardware implementation of AES when available on x86 processors.
  (Faster than the software implementation and less sensitive to
  side channel attacks.)
- Use the Zarith library to implement RSA.
  (Faster than the previous implementation and less sensitive to
  side channel attacks.)
- Support the hardware random number generator present in recent
  x86 processors.
- Rebuilt generated files with Oasis 0.4.6 for OCaml 4.03 compatibility.

(jaapb)