SecureRandom.random_bytes call.
based on the patch by Masahiro Tomita. [ruby-dev:44270]
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to prevent random number sequence repeatation at forked child
process which has same pid.
reported by Eric Wong. [ruby-core:35765]
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/dev/urandom is a symlink in OpenSolaris.
* lib/securerandom.rb (SecureRandom.random_bytes: ditto.
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* lib/cgi/session.rb (create_new_id): use securerandom if available.
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