...to avoid warnings like

> C:/lo64/core/svx/source/table/accessiblecell.cxx(400,12):  error: redundant functional cast from 'long' to 'sal_Int32' (aka 'long') [loplugin:redundantfcast]
>     return sal_Int32(0x0ffffffL);
>            ^~~~~~~~~~~~~~~~~~~~~

with clang-cl

Change-Id: I4a48a9f10ad75f76a3c6ab6152ab279df9a3fbcc
Reviewed-on: https://gerrit.libreoffice.org/51780Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Stephan Bergmann <sbergman@redhat.com>