[libiberty] trivial C++ fixes for libiberty

[Mark Mitchell]

Bernardo Innocenti wrote:

>Hello,
>
>this patch adds a few missing casts that C++ complains about.
>  
>
OK.

>PING: the XNEW/XDELETE patch is still pending as the
>discussion halted before reaching consensus:
>
>  http://gcc.gnu.org/ml/gcc-patches/2004-07/msg00039.html
>  
>
This version is OK; check it in, unless Ian or DJ object.

There is surely more value in having these macros than in spending 
inordinate amounts of time debating exactly how to spell them.

>This version addresses most (not all) of the issues raised
>along the thread.  I already had an earlier version approved,
>but I'd prefer to get it explicitly approved again with the
>discussed changes.
>  
>
-- 
Mark Mitchell
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