gdbserver: Use debug_printf for debug output

gdb/gdbserver/ChangeLog:
2016-11-23  Pedro Alves  <palves@redhat.com>

	* linux-low.c (check_zombie_leaders): Use debug_printf for debug
	output.
	* notif.c (handle_notif_ack, notif_event_enque): Likewise.
	* remote-utils.c (putpkt_binary_1, readchar, getpkt): Use
	debug_printf and debug_flush for debug output.
	* server.c (handle_general_set): Likewise.
	* thread-db.c (try_thread_db_load): Use debug_printf for debug
	output.
6 files changed