_SC_NGROUPS_MAX cannot be used with getgrouplist on OS X

samba.3.6.1.osx-getgrouplist.patch

--- a/source3/lib/system.c	2011-10-18 20:48:48.000000000 +0200
+++ b/source3/lib/system.c	2012-01-04 11:57:25.000000000 +0100
@@ -1159,6 +1159,13 @@
 
 int groups_max(void)
 {
+  /* On OS X, sysconf(_SC_NGROUPS_MAX) returns 16
+   * due to OS X's group nesting and getgrouplist
+   * will return a flat list; users can exceed the
+   * maximum of 16 groups. And easily will.
+   */
+  return 32; // NGROUPS_MAX is defined, hence the define above is void.
+
 #if defined(SYSCONF_SC_NGROUPS_MAX)
 	int ret = sysconf(_SC_NGROUPS_MAX);
 	return (ret == -1) ? NGROUPS_MAX : ret;