There is no point, since it's the size of a pointer anyway

(found by temporarily making the new operator in uno::Reference
deleted).

Change-Id: I62a8b957fef9184f65d705600acfdab4116dcb34
Reviewed-on: https://gerrit.libreoffice.org/19603Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noelgrandin@gmail.com>