[patches] add support for arc4random_buf()

[Edgar Pettijohn]

Please see attached patches to add support for arc4random_buf() as an 
alternate to /dev/{u}random. I tried to be as unobtrusive as possible 
and maintain style. It should also allow the user to still define 
RANDOM_CONF_ONLY_URANDOM if they would prefer to use /dev/urandom. This 
will allow gpg to be used on filesystems mounted nodev while providing 
quick, quality randomness.


Thanks,


Edgar Pettijohn

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