* autoload.cc: Replace autoload statments for ZwXXX by NtXXX.

	* autoload.cc: Replace autoload statments for ZwXXX by NtXXX.
	Drop ZwQuerySystemInformation since NtQuerySystemInformation was
	already available.
	* fhandler_proc.cc (format_proc_uptime): Replace call to
	ZwQuerySystemInformation by call to NtQuerySystemInformation.
	(format_proc_stat): Ditto.
	* fhandler_process.cc (format_process_stat): Replace call to
	ZwQueryInformationProcess by call to NtQueryInformationProcess.
	(get_process_state): Ditto.
	(get_mem_values): Ditto.  Replace call to ZwQueryVirtualMemory by
	call to NtQueryVirtualMemory.
	* ntdll.h: Cleanup.  Drop ZwQuerySystemInformation since
	NtQuerySystemInformation was already available.  Replace declarations
	of ZwXXX functions by declarations of NtXXX.
	* pinfo.cc (winpids::enumNT): Replace call to ZwQuerySystemInformation
	by call to NtQuerySystemInformation.