resolve the Valgrind issue with random numbers. Undo the changes to
RAND_bytes() and RAND_pseudo_bytes() that are redundant in this
respect.
Update documentation and FAQ accordingly, as the PURIFY macro is
available at least since 0.9.7.
manual when the specific function is refered to in the current manual text.
This correction was originally introduced in OpenBSD's tracking of OpenSSL.