* (struct remote_state): New type, only containing
buf and buf_size.
(remote_state): New variable.
(get_remote_state): New function.
(struct remote_arch_state): Renamed from struct remote_state.
Removed buf and buf_size.
(get_remote_arch_state): Renamed from get_remote_state. All
necessary callers updated to call this function.
(init_remote_state): Initialize the architecture-specific state.
Update the target-specific state if necessary.
(get_remote_packet_size): New function. All previous references
changed to use this accessor function.
(packet_reg_from_regnum, packet_reg_from_pnum): Take a
remote_arch_state instead of a remote_state. All callers changed.
(_initialize_remote): Initialize the packet buffer here.