Abi: Add method to guess ABI based on machinet triplet

This code is moved from the gcc toolchain into the ABI class
so that the debugger can reuse it.

Change-Id: I9932f41f69eff9ce5982cfb1f0a2e0add33b91c9
Reviewed-by: hjk <hjk121@nokiamail.com>
TaskList: Remove unused export macros

Change-Id: I0a10ec80fc6a1f5677c13409f1ea5da4aa0d182d
Reviewed-by: Tobias Hunger <tobias.hunger@digia.com>