[Cin] making filegif optional

[Phyllis Smith]

These have been checked into GIT.

On Wed, Apr 6, 2022 at 2:53 PM Andrew Randrianasulu via Cin <
cin at lists.cinelerra-gg.org> wrote:

> because Debian 8.11/ppc only have giflib4, and Cingg fails to use
> it/compile with it.
>
>
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> Cin at lists.cinelerra-gg.org
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