a) Use strcoll() in opendir() and alphasort()

as POSIX 2008 requires. It also matches now how our 'ls' works for years.

b) Remove comment expressed 2 fears:
 1) One just simple describe how strcoll() works in _any_ context,
 not for directories only. Are we plan to remove strcoll() from everything
 just because it is little more complex than strcmp()? I doubt, and
 directories give nothing different here. Moreover, strcoll() used
 in 'ls' for years and nobody complaints yet.

 2) Plain wrong statement about undefined strcoll() behaviour. strcoll()
 always gives predictable results, falling back to strcmp() on any
 trouble, see strcoll(3).

No objections from -current list discussion.

newlib/libc/posix/scandir.c

@@ -142,12 +142,13 @@ fail:
 
 /*
  * Alphabetic order comparison routine for those who want it.
+ * POSIX 2008 requires that alphasort() uses strcoll().
  */
 int
-alphasort (const struct dirent **d1,
-       const struct dirent **d2)
+alphasort(const struct dirent **d1, const struct dirent **d2)
 {
-       return(strcmp((*d1)->d_name, (*d2)->d_name));
+
+	return (strcoll((*d1)->d_name, (*d2)->d_name));
 }
 
 #endif /* ! HAVE_OPENDIR */