bug#20316: 24.5; `string-lessp' doesn't respect value of LC_COLLATE

[Alexis]

Alexis <flexibeast@gmail.com> writes:

> (getenv "LC_COLLATE") => "hr_HR.UTF-8"
>
> (string-lessp "Ć" "D") => nil (string-lessp "Đ" "S") => nil 
> (string-lessp "Š" "Z") => nil

i should add, this happens even with `set-locale-environment' 
specified as 'hr_HR.UTF-8' and/or `set-language-environment' 
specified as 'Croatian'.