PATCH, v3: fix error from configure

Paolo Bonzini
Fri Dec 19 10:53:00 GMT 2008

Ben Elliston wrote:
> On some targets, $target_thread_file can be unset (I'm not sure if that
> is the right behaviour or not).  This patch protects against a "unary
> operator expected" error from the configure script.  OK for mainline?



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