The environment for pyunittests is stored in an array. Meson provides an
environment object, which makes handling of multi-value environment
variables easier and increases code clarity. Switch to using the
environment object.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Kieran Bingham <kieran.bingham@ideasonboard.com>
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