we've been using the normal memory allocator instead of the sal slab
allocator ever since
    commit bc6a5d8e
    Date:   Wed Nov 15 16:52:44 2017 +0530
    Disable custom allocator

Change-Id: I3383962cedb85d56fbec695398901f6ff7057651
Reviewed-on: https://gerrit.libreoffice.org/58577
Tested-by: Jenkins
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>