[PUSHED] Use forward declaration instead of (doubled) #include

[Michael Stahl (via Code Review)]

Hi,

Thank you for your patch!  It has been merged to LibreOffice.

If you are interested in details, please visit

    https://gerrit.libreoffice.org/1642

Approvals:
  Michael Stahl: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: I1cfb65a809e5dd56fb395c2f801bce5e5d75acfe
Gerrit-PatchSet: 2
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: Matteo Casalin <matteo.casalin at gmx.com>
Gerrit-Reviewer: Michael Stahl <mstahl at redhat.com>