Add target_ops argument to to_fileio_open

Add target_ops argument to to_fileio_open

2014-02-19  Tom Tromey  <tromey@redhat.com>

	* target.h (struct target_ops) <to_fileio_open>: Add argument.
	* target.c (target_fileio_open): Add argument.
	* remote.c (remote_hostio_open): Add 'self' argument.
	(remote_bfd_iovec_open): Add 'self' argument.
	(remote_file_put): Add 'self' argument.
	(remote_file_get): Add 'self' argument.
	* inf-child.c (inf_child_fileio_open): Add 'self' argument.