[all][helpers] add script for building auxiliary packages

Instruction to launch this script will be added to HADK as section 8.4
in its pending rev3.

Until then, HADK is broken so this script will have to be run manually.

Change-Id: If8a0e2db0855fd6b14a8ae1f9d5ad65b96fe6539
Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>