lxc: disable python
lxc: disable python

Some substantial cross-compile issues were noticed in the lxc build
thanks to python:

cc1: error: include location "/usr/include/python3.4m" is unsafe for
cross-compilation [-Werror=poison-system-directories]

We don't have a use for the python tooling, nor is it explicitly enabled
through PACKAGECONFIG (or explicitly RDEPENDED on!), so just disable
python support for now.

Signed-off-by: Richard Tollerton <67c688e7f7482ba5c4ebe3d70bc77594748182a6@ni.com>
Natinst-Reviewboard-ID: 107123
Reviewed-by: Alejandro del Castillo <c09cbcd73cd5840fe009d82a3ad13af11b4d7b46@ni.com>
Reviewed-by: Ken Sharp <e6c8ad8f54d15df4645e8aaf3f7a209bc3688570@ni.com>

ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt,ni/meta-nilrt