autobuild: introduce build scripts

autobuild: introduce build 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: Ib98b8308d43cc24f2f5462adca65542318295a9e
Signed-off-by: Raquel Medina <raquel.medina@konsulko.com>
(cherry picked from commit 1bf9036673ecf5d09dc410700569d42c9b846767)