[PATCH] Ensure mktime sets errno on error (bug 23789)

[Paul Eggert]

Albert ARIBAUD (3ADEV) wrote:
> +  if (result == -1)
> +    {
> +      __set_errno(EOVERFLOW);
> +    }

This patch is not correct since -1 is a valid time_t value, and a result of -1 
does not necessarily indicate time_t overflow.