Fix Enumerator::Lazy#{to_enum,enum_for} where method is defined in Lazy

Previously, passing to_enum/enum_for a method that was defined in
Lazy itself returned wrong results:

  [1,2,3].to_enum(:map).to_a
  # => [1, 2, 3]
  [1,2,3].lazy.to_enum(:map).to_a
  # => []

I'm not sure why methods that are designed to be lazy do not work
with to_enum/enum_for.  However, one possible way to work around
this bug is to have to_enum/enum_for use the implementation found
in Enumerable/Enumerator, which is what this commit does.

While this commit works around the problem, it is a band-aid, not a
real fix.  It doesn't handle aliases of Enumerable::Lazy methods,
for instance.  A better fix would be appreciated.

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