The mnRequestedLength fields in formula/ were introduced in

    commit 6ef6dd01
    Author: Kohei Yoshida <kohei.yoshida@collabora.com>
    Date:   Wed Feb 26 14:32:57 2014 -0500
    Store the length of originally requested array size prior to
    trimming.

but then partially removed in

    commit d7f1f91b
    Author: Noel Grandin <noel@peralex.com>
    Date:   Mon Mar 3 13:29:43 2014 +0200
    remove unused code in formula/vectortoken

Change-Id: Ic56b6e42682131ee45df7838867145f980f3d601
Reviewed-on: https://gerrit.libreoffice.org/45571Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Noel Grandin <noel.grandin@collabora.co.uk>