Patch merged into coreboot/master: IASL: Enable warnings as errors

the following patch was just integrated into master:
commit 77c67b3d30d070aa0ddb016d99ce2f1a28cac633
Author: Martin Roth 
Date:   Thu Jun 25 09:36:27 2015 -0600

IASL: Enable warnings as errors

We've actually got more warnings now than when I first tested IASL
    warnings as errors.  Because of this, I'm adding it with the option
    to have it disabled, in hopes that things won't get any worse as we
    work on fixing the IASL warnings that are currently in the codebase.

- Enable IASL warnings as errors
    - Disable warnings as errors in mainboards that currently have warnings.
    - Print a really obnoxious message on those platforms when they build.
    ***** WARNING: IASL warnings as errors is disabled!  *****
    *****          Please fix the ASL for this platform. *****

Change-Id: If0da0ac709bd8c0e8e2dbd3a498fe6ecb5500a81
    Signed-off-by: Martin Roth 
    Reviewed-on: http://review.coreboot.org/10663
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer

See http://review.coreboot.org/10663 for details.

-gerrit