Re: imagemagick format detection code

[Lars Magne Ingebrigtsen]

This is apparently a known bug -- ImageMagick isn't able to guess that
something is an ico file, so it needs "help" from the file name.  So one
could say something like

    MagickSetFilename(wand, "ico:favicon.ico");

But then we'd need to keep an alist of MIME types to suffixes like

Content-Type: image/x-icon

and feed that into `create-image' (er...  ":guessed-suffix"?) and then
set it with that function.

Meh.

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