git: Sync arc4random() with OpenBSD a bit.

[Rimvydas Jasinskas]

commit d0ce80dc6b5a41da926e902cb8b6a31c874b12bc
Author: zrj <rimvydas.jasinskas at gmail.com>
Date:   Fri Aug 19 13:39:18 2016 +0300

    Sync arc4random() with OpenBSD a bit.
    
    Simplify calculation of "2**32 % upper_bound".
    While there, perform some stylistic changes.
    
    Taken-from: OpenBSD

Summary of changes:
 lib/libc/gen/arc4random.c | 48 ++++++++++++++++-------------------------------
 1 file changed, 16 insertions(+), 32 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/d0ce80dc6b5a41da926e902cb8b6a31c874b12bc


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