Patch merged into coreboot/master: util/abuild: Fix update_config function

the following patch was just integrated into master:
commit 6bc44169680816e137ad9450f404c8463e7eb9d9
Author: Martin Roth 
Date:   Tue Dec 13 15:29:30 2016 -0700

util/abuild: Fix update_config function

- Because $configoptions contains embedded newlines that we want to be
    interpreted when we pipe it out to the config file, change that back to
    a printf, and tell shellcheck that we want to do it.
    - 'make olddefconfig' & 'yes "" | make oldconfig' give us the same
    output for the config file, but olddefconfig doesn't generate the log
    the way oldconfig does.  Go back to the previous behavior.
    - Don't overwrite the config log with make savedefconfig.

Change-Id: I4966a3bb2541b452eeb4ca73ac3cd727f8525636
    Signed-off-by: Martin Roth 
    Reviewed-on: https://review.coreboot.org/17853
    Tested-by: build bot (Jenkins)
    Reviewed-by: Paul Menzel 
    Reviewed-by: Patrick Georgi

See https://review.coreboot.org/17853 for details.

-gerrit