build: Add Lineage build support

Squashed also with the following changes:

  Author: Luca Stefani <luca020400@lineageos.org>
  Date:   Thu Aug 17 22:22:13 2017 +0200

    core: Include Lineage pathmap

  Change-Id: Ie25dee383cc5bc9bb6390cff2cb2460d526d80b6

  Author: Simon Shields <simon@lineageos.org>
  Date:   Fri Mar 2 12:55:47 2018 +1100

    build: unconditionally use lineage pathmap

    even if we're not building a lineage target, we need to
    use the lineage pathmap to make things like recovery and ril
    happy

  Change-Id: I974c30ad10d4ff5b7805c3df9c22010f1e002bf1

Change-Id: Iab8b2ef8b644a7bea10bfd28b99d9e69539b1357