[PUSHED] clean up install. of C++ docs

[David Tardon (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/3587

Approvals:
  David Tardon: Verified; Looks good to me, approved


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Gerrit-MessageType: merged
Gerrit-Change-Id: I51841a8c92cb73912757fcc0766b11d8f9be4b77
Gerrit-PatchSet: 3
Gerrit-Project: core
Gerrit-Branch: master
Gerrit-Owner: David Tardon <dtardon at redhat.com>
Gerrit-Reviewer: David Tardon <dtardon at redhat.com>
Gerrit-Reviewer: LibreOffice gerrit bot <gerrit at libreoffice.org>