bug#51381: HEIF image format support

[Alan Third]

On Wed, Oct 27, 2021 at 05:13:17PM +0100, Alan Third wrote:
> 
> FWIW NSImage (on macOS) is already capable of loading an heic file, if
> we just point it to it. I thought all we needed to do is add heic to
> ns_can_use_native_image_api in nsimage.m and then load an image with
> the type of "heic" or whatever, but it doesn't work and I'm not sure
> what else I need to do. Probably define heic as a type elsewhere.

Patch attached. I'm not entirely sure this won't break anything, so
testing on a platform that already supports heif files would probably
be a good idea.

It doesn't support any of the interesting features of heif, for
example it doesn't allow you to view multiple images (like an animated
gif), but I have a suspicion the IM/GM code won't support that anyway,
so no great loss.
-- 
Alan Third

0001-Add-native-HEIC-support-on-macOS-bug-51381.patch
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