Found with bin/find-unneeded-includes
Only removal proposals are dealt with here.

With this patch, find-unneeded-includes gives no more problems

Change-Id: I24e62be7a387d7fd97a36f54eed0ba9d83ddaf0c
Reviewed-on: https://gerrit.libreoffice.org/58667
Tested-by: Jenkins
Reviewed-by: Miklos Vajna <vmiklos@collabora.co.uk>