* autoload.cc (DsGetDcNameW): Replace DsGetDcNameA.

* dcrt0.cc (child_info_spawn::handle_spawn): Drop artificial
	supplementary group list from calling setgroups in parent.
	* grp.cc (internal_getgroups): Drop 9x-only code.  Reformat.
	* sec_auth.cc (get_logon_server): Do everything in WCHAR only.
	(get_user_groups): Ditto.  Use wlogonserver in LookupAccountNameW
	calls, too.
	(is_group_member): Get logon server as first argument and use in call
	to NetLocalGroupGetMembers.
	(get_user_local_groups): Get logon server as first argument and use in
	calls to NetLocalGroupEnum and LookupAccountNameW.  Revamp to work
	more correctly in domain environments.
	(get_server_groups): Accommodate aforementioned changed function calls.
	* security.h (get_logon_server): Change prototype accordingly.
	* uinfo.cc (cygheap_user::env_logsrv): Accommodate changed
	get_logon_server call.

winsup/cygwin/dcrt0.cc

@@ -671,6 +671,7 @@ child_info_spawn::handle_spawn ()
     cygheap->fdtab.move_fd (__stdin, 0);
   if (__stdout >= 0)
     cygheap->fdtab.move_fd (__stdout, 1);
+  cygheap->user.groups.clear_supp ();
 
   ready (true);