Fix last gcc regression for darwin

[Mike Stump]

This fixes the last gcc regression found by Geoff's checker for  
darwin.  Two libstdc++ regressions remain...

2006-06-29  Mike Stump  <mrs@apple.com>

         * gcc.dg/compat/struct-layout-1_generate.c: Don't use common
         on darwin as we can't align commons large enough yet.

I suspect hpux had the same issue we face.  I've put in a request to  
the assembler and linker support aligning commons and when those are  
fixed, I'll pull this patch back out.

Checked in, tested on powerpc-apple-darwin8.5.0.

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