[Backport #3573] include/ruby/ruby.h $B$G(B rb_cRandom $B$r@k8@$7K:$l$F$$$k(B

Backport #3573: include/ruby/ruby.h e$B$Ge(B rb_cRandom
e$B$r@k8@$7K:$l$F$$$ke(B
http://redmine.ruby-lang.org/issues/show/3573

e$B5/I<<Te(B: Kenta M.
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e$B%+%F%4%je(B: core

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r28616 e$B$re(B ruby_1_9_2 e$B%V%i%s%A$X%P%C%/%]!<%H$7$F$/$@$5$$!#e(B