bug#9086: 'dircolors' request: support UPPERCASE suffixes, also, please.

[SciFi]

Hi,

For those of us who use case-SENsitive file systems, and then come across 
filenames with UPPERCASE suffixes, the provided 'dircolors' function does not 
colorize those listings.

What I usually do, every time a new release of coreutils comes out, is to 
duplicate by hand the list of suffixes in src/dircolors.hin to add the 
UPPERCASE versions of all those entries.

But this does not 'fix' any Mixed-casE suffixes, tho.

And I wonder if doubling this list of suffixes has a bit less performance, and 
eats-up a bit more RAM for the LS_COLORS env-var etc.

So, I need to request a change to color processing in various commands (esp'ly 
'ls') to internally process a case-neutral version of the filename to determine 
the highlighting strings to be sent to the screen/terminal/whatever.

The coding logic seems way-too complex for my lil mind to try providing a 
patch.  ;)

Thanks for considering this request.

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