bug#51523: 29.0.50; gnus-mime-view-part-externally very slow

[Gregory Heytings]

> This reminds me of something I've wanted more than a handful of times -- 
> it'd be nice to have a function/macro like
>
> (when-file-has-changed "/etc/mailcap"
>   (do-the-parsing))

See attached patch.

Add-a-macro-to-execute-body-only-when-a-file-has-cha.patch
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