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.

PR: 521

contents of "buf" when calling RAND_*bytes().

buffer can be normally used.

PR: 1529

PR: 1537

PR: 1575

to shut down Winsock unless we know it won't be used [and we never do]
[from HEAD].
PR: 1439

PR: 1381

PR: 1456

build, because it expects DES_INT and the latter didn't make it to first
0.9.8.

Fix various "computed value not used" warnings too.