[PATCH 3 of 3 stable V3] ancestor.deepest: ignore ninteresting while building result (issue3984)

[Chingis Dugarzhapov]

>
> Quote
> http://mercurial.selenic.com/wiki/ContributingChanges#Emailing_patches
>

I prefer both, body + attachment.

@Siddharth, patch is OK for me
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