MFC r268642: libc/gen: small updates to code originating at OpenBSD
arc4random.c - CVS rev. 1.22 Change arc4random_uniform() to calculate ``2**32 % upper_bound'' as ``-upper_bound % upper_bound''. Simplifies the code and makes it the same on both ILP32 and LP64 architectures, and also slightly faster on LP64 architectures by using a 32-bit remainder instead of a 64-bit remainder. - CVS rev. 1.23 Spacing
readpassphrase.c -CVS rev. v 1.24 most obvious unsigned char casts for ctype
Obtained from: OpenBSD
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