[m-rev.] diff: list__filter cleanup

[Julien Fischer]

On Tue, 22 Mar 2005, Zoltan Somogyi wrote:

> library/list.m:
> 	Make the implementation of filter and filter_map more straightforward
> 	by deleting contortions that used to be required for tail recursion in
> 	Prolog.
>

If you haven't done so already, do this on the release branch as well.

Julien.
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