C++-compat clean build

[Mark Kettenis]

> Date: Tue, 01 Oct 2013 13:25:34 +0200
> From: Ondrej Oprala <ooprala@redhat.com>
> 
> Hi,
> this is the first of a few patches I intend to write to make gdb code 
> compile cleanly with -Wc++-compat.
> The idea is to make separate patches for respective subdirs under gdb/, 
> unless someone objects ofc.
> 
> Thanks in advance for any advice/criticism.

Rejected.  Introducing all these casts can't be right.  They hide type
conversion issues and make the code unreadable.