(cherry picked from commit a7762b56)
(cherry picked from commit 6768b669)

sw: docx export: write something more specific for embedded PDF

Doesn't really change anything, but looks nicer.

(cherry picked from commit 6c569a2e)
(cherry picked from commit f8e628ab)

Change-Id: Ieb308d717aa661fa51bd1b9dd3d0a12ca61337c1
Reviewed-on: https://gerrit.libreoffice.org/20758Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Miklos Vajna <vmiklos@collabora.co.uk>
(cherry picked from commit c8c52960)