at least 10 years ago, so don't require DirectX
to build the avmediawin library which uses DirectShow.

Patch by: me

(cherry picked from commit 8a8dd41e)

Change-Id: I10926cb3c34bf3986c0341c1151360f1dfd5a21e
Reviewed-on: https://gerrit.libreoffice.org/32411Tested-by: Jenkins <ci@libreoffice.org>
Reviewed-by: Caolán McNamara <caolanm@redhat.com>
Tested-by: Caolán McNamara <caolanm@redhat.com>