Fix errors that occur in build with clang 3.7.0

Change-Id: I0e8743f2b6a288d10b4e78e884ce34cfca4dd77c
Reviewed-on: https://gerrit.libreoffice.org/18738Reviewed-by: Stephan Bergmann <sbergman@redhat.com>
Tested-by: Stephan Bergmann <sbergman@redhat.com>