Patch merged into coreboot/master: SeaBIOS: Change clean to just 'rm -rf seabios/out'

the following patch was just integrated into master:
commit ac83367a7b2bc7a3a75e649fcbf6428ef6c9ccdd
Author: Martin Roth 
Date:   Wed Jun 24 19:43:17 2015 -0600

SeaBIOS: Change clean to just 'rm -rf seabios/out'

When running 'make clean' if the seabios directory is present, we get
    warnings about not having IASL installed or that the C compiler can't
    be executed.  It fails to actually run the clean because we're not
    correctly passing in the toolchain.

Just do what the SeaBIOS clean does directly and delete the 'out'
    directory without actually calling the SeaBIOS clean.

Here were the previous warnings:

% make clean
    Unable to execute the C compiler ().

Please install a working compiler and retry.
    Makefile:104: *** "Please upgrade the build environment".  Stop.

or

% make clean
    The SeaBIOS project requires the 'iasl' package be installed.
    Many Linux distributions have this package.
    Try: sudo yum install iasl
    Or: sudo apt-get install iasl

Please install iasl and retry.
    Makefile:106: *** "Please upgrade the build environment".  Stop.

Change-Id: Ice41376bc242f1f622d849e7628f8a9b6ef47404
    Signed-off-by: Martin Roth 
    Reviewed-on: http://review.coreboot.org/10655
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Patrick Georgi

See http://review.coreboot.org/10655 for details.

-gerrit