vcl PDF export, norefxobj: add UI for this

Disable the "use reference XObjects" (old behavior) by default, but keep
it as an option in case someone wants it.

Summary till the help is updated: the old way is simpler code, so it's
always correct, but really only Acrobat supports that markup. The new
way is supported by all readers, but more complex, so it's more likely
it goes wrong.

Change-Id: I4769474f29d98412be496a0aa4e8254ae4f0919e
Reviewed-on: https://gerrit.libreoffice.org/35826
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>
Tested-by: Jenkins <ci@libreoffice.org>

0 files changed, 0 insertions, 0 deletions