[patch] Avoid gcc specific compiler flags

[Mark Kettenis]

> From: Paul Brook <paul@codesourcery.com>
> Date: Mon, 6 Mar 2006 15:18:23 +0000
> 
> The attached patch allows a dejagnu target description to override the 
> compiler flag used to disable warnings when running the gdb testsuite.
> 
> Ok?

Looks fine to me expect for a double  $nowarnings in the gdb.exp bit.

Mark