Convert boolean globals in server.c to bool

Convert boolean globals in server.c to bool

Converts the int globals to bool.

gdb/gdbserver/ChangeLog:

2019-10-02  Christian Biesinger  <cbiesinger@google.com>

	* server.c (server_waiting): Change to bool.
	(extended_protocol): Likewise.
	(response_needed): Likewise.
	(exit_requested): Likewise.
	(run_once): Likewise.
	(report_no_resumed): Likewise.
	(non_stop): Likewise.
	(disable_packet_vCont): Likewise.
	(disable_packet_Tthread): Likewise.
	(disable_packet_qC): Likewise.
	(disable_packet_qfThreadInfo): Likewise.
	(handle_general_set): Update.
	(handle_detach): Update.
	(handle_monitor_command): Update.
	(handle_query): Update.
	(captured_main): Update.
	(process_serial_event): Update.
	* server.h (server_waiting): Change to bool.
	(disable_packet_vCont): Likewise.
	(disable_packet_Tthread): Likewise.
	(disable_packet_qC): Likewise.
	(disable_packet_qfThreadInfo): Likewise.
	(run_once): Likewise.
	(non_stop): Likewise.
	* target.c (target_stop_and_wait): Update.