Minor update to eval.txt

[Yegappan Lakshmanan]

Hi,

The 'vartabs' feature is not listed under the feature-list in eval.txt.

- Yegappan

[Bram Moolenaar]

Yegappan wrote:

> The 'vartabs' feature is not listed under the feature-list in eval.txt.

I'll add it.

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