- Cleaned up and sanitized /challenge related code
- rsa.c:get_randomness(): removed EGD support; also don't fall back to RAND_pseudo_bytes()
  if RAND_bytes() fails. If RAND_bytes() fails, just reject the /challenge request.


git-svn-id: svn://svn.ircd-hybrid.org/svnroot/ircd-hybrid/branches/8.2.x@4253 82007160-df01-0410-b94d-b575c5fd34c7