[Committed] Fix libobjc again (this time for darwin)

[Andrew_Pinski@PlayStation.Sony.Com]

Hi,
  I had messed up my last patch to fix libobjc after the new libtool as I 
had forgot why libext was there in the first place.  I had added it to 
support the GNU runtime under darwin.  So the new libtool also used libext 
for the library extension.  So now I need a new variable name, I decided 
on libsuffix and I am hoping that nothing will ever use this variable name 
:).


Committed to the trunk after a bootstrap/test on i686-linux-gnu with no 
regressions.

Thanks,
Andrew Pinski

libobjc/ChangeLog:
        * Makefile.in: Replace all uses of libext with libsuffix.
        * configure.ac: Likewise.
        * configure: Regenerate.

        Revert:
        * Makefile.in: Remove all uses of $(libext).

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