dw2gencfi rewrite

[Nick Clifton]

Hi Alan,

> Doesn't work on my version of dejagnu.  The following does.  I'm not
> sure if I'm allowed to commit this, or who needs to approve it.
> Nick?

Dejagnu is a separately maintained project, so officially the patch
should go to:

       dejagnu@gnu.org

However, binutils has been very lax a keeping its copy in sync with
the savannah version, so I'll apply this patch anyway.

Cheers
        Nick
        
> dejagnu/ChangeLog
> 	* lib/target.exp (prune_warnings): Correct pic/PIC regexp.
> 	Ignore incompatible library warning.

Applied.