bug#16731: 24.3.50; Latin small letter sharp s is not considered lower-case

[Jorgen Schaefer]

Hi!
The following seems like a bug:

(string-match "[[:lower:]]" "ß") => nil

`describe-char' for this says:

  name: LATIN SMALL LETTER SHARP S
  general-category: Ll (Letter, Lowercase)
  decomposition: (223) ('ß')

Not sure why it would not be considered a lower-case letter. Umlauts
like ä, ö and ü are matched correctly.

Regards,
        -- Jorgen

Configured using:
 `configure --without-x'

Important settings:
  value of $LC_ALL: 
  value of $LC_COLLATE: de_DE.UTF-8
  value of $LC_CTYPE: de_DE.UTF-8
  value of $LC_MESSAGES: POSIX
  value of $LC_MONETARY: POSIX
  value of $LC_NUMERIC: POSIX
  value of $LC_TIME: POSIX
  value of $LANG: POSIX
  locale-coding-system: utf-8-unix