new modules 'wmemcmp', ..., 'wcswidth'

[Bruno Haible]

> Let's start with the 'wmemchr' function.

And here are proposed modules for the other wide string functions that are
declared in <wchar.h>:

  wmemcmp
  wmemcpy
  wmemmove
  wmemset
  wcslen
  wcsnlen
  wcscpy
  wcpcpy
  wcsncpy
  wcpncpy
  wcscat
  wcsncat
  wcscmp
  wcsncmp
  wcscasecmp
  wcsncasecmp
  wcscoll
  wcsxfrm
  wcsdup
  wcschr
  wcsrchr
  wcscspn
  wcsspn
  wcspbrk
  wcsstr
  wcstok
  wcswidth

It's always the same idioms, except for wcswidth which may need to be replaced.
The implementation comes from libutf8, except for wcscoll and wcsxfrm which is
new and a bit complicated code (untested so far; review is appreciated).

Bruno
--  
In memoriam Chris Gueffroy <http://en.wikipedia.org/wiki/Chris_Gueffroy>

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