Fix #6061 : Revert commits to fix bootstrapping issue 6061#6062

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pnkfelix wants to merge 2 commits intorust-lang:incomingfrom

pnkfelix:revert-commits-to-fix-bootstrapping-issue-6061

Commits on Apr 25, 2013

Revert "libcore: unify `gen_<type>` methods on `rand::RngUtil` into the generic `gen`."
pnkfelix
committed
Revert "libcore: remove unnecessary deref"
pnkfelix
committed