UBUNTU: [Packaging] buildinfo -- add compiler information to the flavour ABI

UBUNTU: [Packaging] buildinfo -- add compiler information to the flavour ABI

In getabis we extract the compiler information from an arbitrary .ko.
As we will not have those when only using buildinfo ABI information we
need to collect the compiler information during the build.

BugLink: http://bugs.launchpad.net/bugs/1806380
Signed-off-by: Andy Whitcroft <apw@canonical.com>
Acked-by: Seth Forshee <seth.forshee@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kamal Mostafa <kamal@canonical.com>
Signed-off-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>