Patch merged into coreboot/master: util/abuild: Add argument -R to specify root directory

the following patch was just integrated into master:
commit 5b0d2dbdceacca09b9758a92ad078aa18256d469
Author: Martin Roth 
Date:   Tue Dec 6 09:18:36 2016 -0700

util/abuild: Add argument -R to specify root directory

cbroot was previously specified by just adding it to the end of the
    command line with no explicit identifier.  This change allows it to
    go anywhere in the command line and adds the -R or --root identifier.

This makes the command line more consistent.  Most of the time, this
    argument isn't even needed, as the automatic detection finds cbroot.

Change-Id: I1d6fd8f51765d0d8b29be8af1e8105e06dd44cc8
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/17740
    Tested-by: build bot (Jenkins)
    Reviewed-by: Patrick Georgi

See https://review.coreboot.org/17740 for details.

-gerrit