[Rev 05] RFR: Add support for offline and local builds

[Erik Helin]

The pull request has been updated with additional changes.

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Added commits:
 - 4d96e1af: Add AArch64 support and fix exception message

Changes:
  - all: https://git.openjdk.java.net/skara/pull/237/files
  - new: https://git.openjdk.java.net/skara/pull/237/files/b68a41a9..4d96e1af

Webrevs:
 - full: https://webrevs.openjdk.java.net/skara/237/webrev.05
 - incr: https://webrevs.openjdk.java.net/skara/237/webrev.04-05

  Stats: 7 lines in 2 files changed: 6 ins; 0 del; 1 mod
  Patch: https://git.openjdk.java.net/skara/pull/237.diff
  Fetch: git fetch https://git.openjdk.java.net/skara pull/237/head:pull/237

PR: https://git.openjdk.java.net/skara/pull/237