[PATCH] Ignore case when opening files in FAT

[Bean]

Hi,

As FAT is basically a case insensitive file system, we should ignore
case when opening files.

For example, normally efi image would be placed in EFI/grub directory.
After startup, the prefix would be set to something like
(hd0,1)/EFI/grub/. But inside grub, it convert pathname to lowercase,
EFI would become efi, so grub can't open it anymore. With this patch,
fat ignore case, so we can access files using /efi/grub as well as
/EFI/grub.

-- 
Bean

fat.diff
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