[racket-dev] patch for make-base-eval

Can I push the attached (1-line) patch? I don't have a good grasp of
namespaces so I would like someone to review it first.

Right now, make-base-eval tries to attach racket/pretty to the
namespace regardless of whether it's already there, which sometimes
results in an exception (for example if the #lang given to
make-base-eval is racket).

The patch simply first checks if the desired identifier is already there.
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