This adds the aes_cfb8 cypher type (and associated tests and
documentation) to the crypto module.

These are some files that were erronously missed earlier:

   erts/doc/src/time_correction.xml
   lib/crypto/doc/src/crypto_app.xml
   lib/snmp/doc/src/snmpa_mib_data.xml
   lib/snmp/doc/src/snmpa_mib_storage.xml

* lukas/ose/master/OTP-11334: (71 commits)
  erts: Fix unix efile assert
  ose: Use -O2 when building
  ose: Expand OSE docs
  ose: Add dummy ttsl driver
  ose: Cleanup cleanup of mutex selection defines
  ose: Polish mmap configure checks
  ose: Add ose specific x-compile flags
  ose: Updating fd_driver and spawn_driver for OSE
  ose: Updating event and signal API for OSE
  ose: Cleanup of mutex selection defines
  win32: Compile erl_log.exe
  ose: Remove uneccesary define
  ose: Fix ssl configure test for osx
  erts: Fix sys_msg_dispatcher assert
  ose: Fix broken doc links
  ose: Thread priorities configurable from lmconf
  ose: Yielding the cpu is done "the OSE" way
  ose: Start using ppdata for tse key
  ose: Do not use spinlocks on OSE
  ose: Fix support for crypto
  ...

Conflicts:
	lib/crypto/c_src/crypto.c

This function is needed on OSs that do not automatically
initialize the PRNG seed.

Symptom: Using an old context (that had already been passed as argument to either
hmac_upgrade or hmac_final) could cause VM crash or worse.

Reason: Only a shallow copy (memcpy) of the context was made causing
a new context to partly mutate its parent context into an inconsistent
state.

Problem: Only OpenSSL v1.0 supports deep copy of hmac context. It is thus
not possible to implement a functional interface for older OpenSSL
versions (0.9.8) which still have wide spread use.

Solution: Change hmac contexts into a mutable state using NIF resources.
Document reuse of old contexts as undefined.

Future: If a need for reusing old context variables arise, a new hmac_copy
function could be introduced that is only supported for OpenSSL v1.0.

* andrewtj/atj-crypto-chiphertext-typo:
  crypto: Fix 'ChipherText' typo in doc

OTP-11609

Newer OpenSSL versions allow to selectively disable GF2m elliptic curves.
Selectively enable GF2m curves is support for them is available.