RFA: (testsuite): make darwin as untested in bigcore.exp

[Mark Kettenis]

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> From: Tristan Gingold <gingold@adacore.com>
> Date: Mon, 29 Jun 2009 17:48:51 +0200
> 
> Hi,
> 
> the darwin kernel isn't very good at generating core files.  In  
> particular it lacks sparse corefile support.
> This patch adjust the bigcore.exp testcase for Darwin.
> 
> Tristan.
> 
> gdb/testsuite:
> 2009-06-29  Tristan Gingold  <gingold@adacore.com>
> 
> 	* gdb.base/bigcore.exp: Make darwin untested.

ok