[PATCH] Remove C++ style comments from string3.h

[Florian Weimer]

* Adhemerval Zanella:

> -// XXX We have no corresponding builtin yet.
> +/* XXX We have no corresponding builtin yet.  */
>  extern char *__stpncpy_chk (char *__dest, const char *__src, size_t __n,
>  			    size_t __destlen) __THROW;
>  extern char *__REDIRECT_NTH (__stpncpy_alias, (char *__dest, const char *__src,

I think the comment is outdated, because such a builtin exists now:

/tmp/t.c:3:22: note: expected ‘char *’ but argument is of type ‘int’
/tmp/t.c:3:25: warning: passing argument 2 of ‘__builtin_stpncpy’ makes pointer from integer without a cast
   __builtin_stpncpy (1, 2, 3);
                         ^
This is with gcc version 4.9.2 (Debian 4.9.2-10).

Perhaps remove it and file a bug to clean this up?