stage: better deprecated/internal message (could be disable)
stage: better deprecated/internal message (could be disable)

use ${U_TARGET}_I_KNOW_IT_IS_DEPRECATED

dmerejkowsky/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild,dmerejkowsky/qibuild,dmerejkowsky/qibuild,aldebaran/qibuild,aldebaran/qibuild