Git commits in Moodle 3.5.3 by Tim Lock

commit b6960fa2244fcbfdb315668e15f08aef1507fed5
Author: Tim Lock <tim@netspot.com.au>
Date:   Tue, 11 Sep 2018 11:06:44 +0800
Tag:    v3.5.3

MDL-63267 tool_privacy: Handle modules without privacy support.

commit e0d05a355a8e9a21a42183fa9ee2b968634190ff
Author: Tim Lock <tim@netspot.com.au>
Date:   Fri, 07 Sep 2018 12:24:29 +0800
Tag:    v3.5.3

MDL-63321 block: Fix warning in Calendar month block after MDL-60587