Prerelease is not a treat on ia64 (at least older ia64 systems)

[Mark Mitchell]

Joe Buck wrote

>Just got a failure.
>
>This release will not bootstrap on an ia64 system running Red Hat
>AW 2.1, because of the (known) libunwind problem.
>  
>
Jakub, is this something you could help with?  In the past, you have 
demonstrated the ability to make sense out of all of this shared library 
complexity...

-- 
Mark Mitchell
CodeSourcery, LLC
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mark@codesourcery.com