Add autobuild scripts to alexa-voiceagent-service via a patch to
prepare for a switch to building all widgets via calls to autobuid.

Bug-AGL: SPEC-2049, SPEC-3300

Signed-off-by: Scott Murray <scott.murray@konsulko.com>
Change-Id: Ia1a3ea814bca5429848055db8350ad37cae9517a