that way we can use cairo to text render etc onto our basebmp-backed
headless/gtk3 virtual devices

Change-Id: I91002b610b72a4fe1d2094a57c5cb1b6b5d69cb1
Reviewed-on: https://gerrit.libreoffice.org/19957Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>