Should fix the RHEL6 build.

Change-Id: I3d6e6a2b43c2d6a43ea0686600cf2f893c518cc8
Reviewed-on: https://gerrit.libreoffice.org/18566Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>