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By merging make_all.sh to Makefile, parallel make can be made faster. Previously, if one does 'util/make_all.sh -j32', most of the time is spent on waiting for linking. Now that we invoke sub-make, linking an executable doesn't block the next board. With '-j32', the new 'make buildall' takes about 7 seconds, while the original 'util/make_all.sh' takes about 27 seconds. BUG=None TEST=make buildall -j32 BRANCH=None Change-Id: I7c2f0d1e928a9b60a8a9070bdcb71b00a3d534cd Signed-off-by: Vic (Chun-Ju) Yang <victoryang@chromium.org> Reviewed-on: https://chromium-review.googlesource.com/181091 Reviewed-by: Vincent Palatin <vpalatin@chromium.org>