bug#54492: 27.2; image-convert cannot convert BMP file

[Eli Zaretskii]

> From: awrhygty@outlook.com
> Date: Mon, 21 Mar 2022 22:14:00 +0900
> 
> 
> With image-convert, I can view WEBP files.
> But BMP files cannot be displayed.
> With find-file BMP image, emacs reports:
>   Cannot display image: (Invalid image type ‘bmp’)
> 
> The form (create-image "tmp.webp") is successfull,
> but the forms (create-image "tmp.bmp")
> or (create-image "tmp.bmp" 'image/bmp) fail.
> They occur errors:
>   Invalid image type ‘bmp’
>   Invalid image type ‘image/bmp’

I don't think Emacs supports display of BMP files as of now.