python: disable building ossaudiodev module for host-python

This module is not needed to build the target Python, and can cause
some build issues on certain systems (when <linux/soundcard.h> does
not contain the OSS related definitions).

Signed-off-by: Zoltan Gyarmati <mr.zoltan.gyarmati@gmail.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>