autobuild: introduce autobuild scripts

autobuild: introduce autobuild scripts

 - Add agl autobuild script to silence build
    warnings on yocto.
 - Add linux autobuild script to build with
   the sdk

These  2 scripts are based on the latest version
of the autobuild script, but they've been
customized to (i) work with the existing qmake
files and (ii) the 'update' and 'package-test'
targets have been removed.

Bug-AGL: SPEC-2164

Change-Id: I5da155ab9d6e0f75d637be5997054cefa52f5e2c
Signed-off-by: Raquel Medina <raquel.medina@konsulko.com>
(cherry picked from commit f2d3da19a294487fa41a81674ab2ef10fde04dd8)