Partially reverts commit e8f63357
which has added an overlooked second `include targets.mk' which
began spamming build.log immediately:

  /usr/share/mkimage/targets.mk:23: warning:
    overriding recipe for target `__profile_internal_rule'
  /usr/share/mkimage/targets.mk:23: warning:
    ignoring old recipe for target `__profile_internal_rule'

*sigh*