Hello,

The file rs6000-nat.c contains GDB's only warning_begin() call.  This 
patch should eliminate it.  Ok?  I think it is ok - don't have an rs6000 
handy.

It also adds a vwarning() function.  A next pass is to cleanup code like 
language.c:type_error() replacing its body with vwarning() and verror() 
calls.

enjoy,
Andrew