[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: Iecc6dad8693d205a6e029a8a48de1cbe3c2e92b5
Signed-off-by: Simonas Leleiva <simonas.leleiva@jollamobile.com>