[Xtensa] xfail gas redef test

[Bob Wilson]

The Xtensa port of gas fails the redef test.  This is expected because of the 
way that difference of symbols expressions are handled.  I've committed this 
patch to mark the expected failure.

2008-08-20  Bob Wilson  <bob.wilson@acm.org>

         * gas/all/gas.exp: Expect the redef test to fail on Xtensa.
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