It has ~no users, can't even be built on modern Linuxes, and it annoys
folks who want to refactor VCL.

Per ESC decision from 2017-06-08, remove --enable-tde and --enable-tdeab.

Change-Id: I51ce4786f29f8fcac2e2bb2a654c41fbfbbd8afd
Reviewed-on: https://gerrit.libreoffice.org/38718Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Michael Stahl <mstahl@redhat.com>