Patch merged into coreboot/master: util/cbfstool: compile with -O2 by default

the following patch was just integrated into master:
commit 8474e7d7e83e92f3d7118311e2e35dc86dcc3ef5
Author: Patrick Georgi 
Date:   Wed Jan 11 17:17:18 2017 +0100

util/cbfstool: compile with -O2 by default

This speeds up the lzma encoder approximately four-fold.

Change-Id: Ibf896098799693ddd0f8a6c74bda2e518ecea869
    Signed-off-by: Patrick Georgi 
    Reviewed-on: https://review.coreboot.org/18098
    Tested-by: build bot (Jenkins)
    Reviewed-by: Stefan Reinauer 
    Reviewed-by: Paul Menzel

See https://review.coreboot.org/18098 for details.

-gerrit