remote.c: don't install a deprecated_xfer_memory hook.

remote.c: don't install a deprecated_xfer_memory hook.

There's no need for deprecated_xfer_memory nowadays.  Memory access
goes through target_xfer_partial/TARGET_OBJECT_MEMORY, etc.  In fact,
the remote target already handles that, and is deferring to the same
helpers the deprecated_xfer_memory hook is.  Basically, only a few
adjustments to make these helper routines's interfaces closer to
target_xfer_partial's were necessary.

Tested on x86_64 Fedora 17 w/ gdbserver.

gdb/
2013-08-23  Pedro Alves  <palves@redhat.com>

	* remote.c (remote_write_bytes_aux, remote_write_bytes)
	(remote_read_bytes): Change return type to LONGEST, and adjust to
	return a target_xfer_error on error.
	(remote_xfer_memory): Delete.
	(remote_flash_write): Change type of 'ret' local to LONGEST.
	(remote_xfer_partial, remote_xfer_partial): Adjust.
	(init_remote_ops): Don't install a deprecated_xfer_memory hook.