* fhandler.cc (fhandler_base::fhaccess): Accommodate interface changes

of access control functions throughout.
	* fhandler_disk_file.cc: Ditto.
	* fhandler_registry.cc: Ditto.
	* sec_acl.cc: Drop unnecessary includes.
	(setacl): Take path_conv instead of file name as parameter.
	Accommodate interface changes of access control functions.
	(getacl): Ditto.
	* sec_auth.cc: New file, taking over all authentication related
	functions from security.cc.
	* sec_helper.cc: Drop unnecessary includes.
	* security.cc: Ditto.  Move all authentication related functions to
	sec_auth.cc.
	(ALL_SECURITY_INFORMATION): New define.  Use throughout.
	(set_file_sd): New function, replacing read_sd and the file related
	part of get_nt_object_security.
	(get_reg_sd): Rename from get_reg_security.  Drop type parameter.
	(get_reg_attribute): New function, replacing the registry related part
	of get_nt_object_security.
	(get_file_attribute): Take path_conv instead of file name as parameter.
	Use new get_file_sd call.
	(set_file_attribute): Ditto plus new set_file_sd.  Drop unnecessary
	implementation without uid/gid parameters.
	(check_file_access): Take path_conv instead of file name as parameter.
	Use new get_file_sd call.
	(check_registry_access): Use new get_reg_sd call.
	* security.h: Accommodate above interface changes.

winsup/cygwin/sec_helper.cc

@@ -11,17 +11,8 @@ Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
 details. */
 
 #include "winsup.h"
-#include <grp.h>
-#include <pwd.h>
-#include <unistd.h>
 #include <stdlib.h>
-#include <limits.h>
-#include <sys/stat.h>
 #include <sys/acl.h>
-#include <ctype.h>
-#include <wingdi.h>
-#include <winuser.h>
-#include <wininet.h>
 #include "cygerrno.h"
 #include "security.h"
 #include "path.h"
@@ -29,7 +20,6 @@ details. */
 #include "dtable.h"
 #include "pinfo.h"
 #include "cygheap.h"
-#include "cygtls.h"
 #include "pwdgrp.h"
 #include "ntdll.h"