Git commits in Moodle 1.9.15 by Tim Hunt

commit 9d656f584ad11ef8c3543a83ab7e79ee8fff4661
Author: Tim Hunt <T.J.Hunt@open.ac.uk>
Date:   Wed, 02 Nov 2011 01:35:35 +0800
Tag:    v1.9.15

MDL-30038 mod_lesson was not working on PHP4.