Improved sudo to explicitely disable pam support if pam is not available

base/sudo/sudo.conf

@@ -2,6 +2,7 @@
 # This copyright note is auto-generated by ./scripts/Create-CopyPatch.
 #
 # Filename: package/.../sudo/sudo.conf
+# Copyright (C) 2008 The OpenSDE Project
 # Copyright (C) 2004 - 2006 The T2 SDE Project
 # Copyright (C) 1998 - 2003 Clifford Wolf
 #
@@ -15,3 +16,6 @@
 
 extraconfopt="--with-insults --with-all-insults --enable-log-host --with-tty-tickets"
 
+if ! pkginstalled pam; then
+	var_append extraconfopt ' ' '--without-pam'
+fi