Removed #includes including themselves

Change-Id: I3fe3227967e07b6b0c82dccf3c9400bfe6e1d729
Reviewed-on: https://gerrit.libreoffice.org/12292
Reviewed-by: Riccardo Magliocchetti <riccardo.magliocchetti@gmail.com>
Reviewed-by: Michael Stahl <mstahl@redhat.com>
Tested-by: Michael Stahl <mstahl@redhat.com>