Dump the constant NGROUPS in favor of the POSIX way:

sysconf(_SC_NGROUPS_MAX).

Submitted by:	bde

lib/libc/sys/getgroups.2

@@ -30,7 +30,7 @@
 .\" SUCH DAMAGE.
 .\"
 .\"     @(#)getgroups.2	8.2 (Berkeley) 4/16/94
-.\"     $Id$
+.\"     $Id: getgroups.2,v 1.3 1998/01/11 22:01:20 alex Exp $
 .\"
 .Dd April 16, 1994
 .Dt GETGROUPS 2
@@ -54,13 +54,9 @@ indicates the number of entries that may be placed in
 .Fa gidset .
 .Fn Getgroups
 returns the actual number of groups returned in
-.Fa gidset .
-No more than
-.Dv NGROUPS ,
-as defined in
-.Aq Pa sys/param.h ,
-will ever
-be returned.
+.Fa gidset ,
+which is limited to the value returned by
+.Fn sysconf _SC_NGROUPS_MAX .
 If
 .Fa gidsetlen
 is zero,
@@ -90,7 +86,8 @@ an invalid address.
 .El
 .Sh SEE ALSO
 .Xr setgroups 2 ,
-.Xr initgroups 3
+.Xr initgroups 3 ,
+.Xr sysconf 3
 .Sh HISTORY
 The
 .Fn getgroups