Update to Botan 1.8.14:

* 1.8.14, 2012-07-18

- The malloc allocator would return null instead of throwing in the event of
  an allocation failure, which could cause an application crash due to null
  pointer dereference where normally an exception would occur.
- Recent versions of OpenSSL include extra information in ECC private keys,
  the presence of which caused an exception when such a key was loaded by
  botan. The decoding of ECC private keys has been changed to ignore these
  fields if they are set.
- AutoSeeded_RNG has been changed to prefer /dev/random over /dev/urandom
- Fix detection of s390x (Debian bug 638347)

(pettai)