[COMMIT] Modify XLIKE_get_gc's prototype

[Didier Verna]

Ben Wing wrote:

> Didier ... when you make changes like this, could you put the
> explanatory text (in this case, the explanation above about why this
> change is being made) in the ChangeLog entry as well as just in the
> email? This would help in the future if I or someone else was trying
> to figure out why a change was made.

  Sure.

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