* remote-fileio.c (remote_fileio_return_success): Take a gdb_byte

	* remote-fileio.c (remote_fileio_return_success): Take a gdb_byte
	argument.
	(remote_fileio_func_open, remote_fileio_func_rename)
	(remote_fileio_func_unlink, remote_fileio_func_stat)
	(remote_fileio_func_fstat, remote_fileio_func_gettimeofday)
	(remote_fileio_func_system): Cast the arguments to
	remote_read_bytes and remote_write_bytes.
	(remote_fileio_func_read, remote_fileio_func_write): Use a
	gdb_byte buffer.
	* remote.h (remote_read_bytes, remote_write_bytes): Update
	prototypes.
	* remote.c (hex2bin, bin2hex): Use gdb_byte for the BIN argument.
	(threadref_to_int): Replace bogus char * cast.
	(remote_unpack_thread_info_response): Use int for tag.
	(remote_threads_extra_info, remote_check_symbols): Cast string
	arguments to hex2bin.
	(remote_wait): Use a char buffer for packets and a gdb_byte
	buffer for registers.
	(remote_async_wait): Likewise.
	(remote_prepare_to_store, store_register_using_P)
	(remote_store_registers): Use gdb_byte buffers.
	(remote_write_bytes, remote_read_bytes): Use a gdb_byte pointer
	for MYADDR and char buffers for strings.
	(remote_xfer_partial): Add casts for string operations on READBUF.
	(remote_rcmd): Cast strings passed to bin2hex.