GRUB doesn't allow background images with upper case file extensions

[Alexander Kurtz]

Dear GRUB developers,

when I try to use background images with upper case file extensions
(e.g. `foo.JPEG') it doesn't work. If I try to debug this manually from
the grub shell, I get this:

        grub> background_image /grub/comet.JPEG
        error: unsupported bitmap format
        grub>

This is unfortunate since most digital cameras produce images with upper
case file extensions. FAT filesystems and Windows in general might be
other sources of files with upper case file extensions.

I can confirm that the attached patch fixes the problem for me. If you
have no objections, please include it in the next version.

Best regards

Alexander Kurtz

PS: I first reported this to the Debian BTS, see
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=611123

ignore-case-of-file-extensions.patch
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