Disable SC2154 for deprecated variables.
Disable SC2154 for deprecated variables.

The msg "$var is referenced but not assigned" is logical as $var is
defined in an outdated installer-config.txt.

Signed-off-by: Diederik de Haas <64b2b6d12bfe4baae7dad3d018f8cbf6b0e7a044@cknow.org>

yodaaut/raspbian-ua-netinst