eliminate deprecated_insert_raw_breakpoint. what's left.

[Maciej W. Rozycki]

On Wed, 10 Sep 2014, Pedro Alves wrote:

> Meanwhile, I'd prefer removing deprecated_insert_raw_breakpoint
> now rather than keeping it just for IRIX.  I may send a
> best-effort-but-untested patch for IRIX.  If things break, it'd be
> the job of whoever shows up as wanting to maintain IRIX to
> fix and modernize things further.  WDYT?

 FWIW I have no objections to this plan.  I wonder if there's anything 
special here actually or if it's just that nobody bothered to convert this 
code to using `create_internal_breakpoint' or suchlike.

  Maciej