Hello,

The attached renames the BFD object to `struct bfd' from `struct _bfd'. 
  To ensure backward compatibility with existing code it also #defines 
_bfd -> bfd.

Having `struct bfd' available will, I think, legitimize its use as an 
opaque declaration vis:

	struct bfd;
	void func (struct bfd *abfd);

Also, as far as I know, symbols with a leading `_' live in the system 
name space.

Ok to commit?
Andrew