bug#22202: 24.5; SECURITY ISSUE -- Emacs Server vulnerable to random number generator attack on Windows systems

[Paul Eggert]

Eli, thanks for improving the initial seed for (random t) in Emacs. I noticed 
that with this change, my Emacs was opening /dev/urandom twice, because GnuTLS 
does something similar during startup. Also, it was reading more data from 
/dev/urandom than it needed, due to stdio buffering. So I installed the attached 
patch, which defers to GnuTLS and falls back on doing things by hand (without 
stdio) only if GnuTLS is not available or fails. I assume this approach works 
under MS-Windows; if not please let me know and I'll try to fix it.

Would you mind if I removed the newly-added details about current time and 
process ID from the documentation? The idea is that this is internal 
implementation detail that users should not rely on.

0001-Prefer-GnuTLS-when-acquiring-random-seed.patch
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