bug#8401: removing duplication and improving the readlink code

[Paul Eggert]

On 04/03/2011 09:41 AM, Stefan Monnier wrote:
> In which way does it make it smaller?  Do you mean the source code
> exclusing the gnulib imported modues, or do you really mean
> the executable?

I meant less memory used at runtime, because a patched
Emacs typically skips a malloc when it reads a link.
(The non-gnulib source code also shrinks.)  These effects
are both minor, of course.