[rubygems/rubygems] Fix `require` of a default gem when unresolved gems depend on it

The following conditions must be met:

* A default gem is required.
* A previous require left some gems unresolved, and those dependencies
  themselves depend on the default gem.

In this case, rubygems require will first activate the default version
of the gem, then try to activate another unresolved version of the
default gem that conflicts with the first activation.

The solution is, if we are in the middle of requiring a default gem,
skip this step, because we have already activated it successfully.

https://github.com/rubygems/rubygems/commit/8cd5608db5

Co-authored-by: Stan Hu <stanhu@gmail.com>

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