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Ninja has a quirk that makes it blind to incremental source file
changes, so long as the source files' timestamp precedes the last
build time. As a result Ninja was not correctly picking up changes
in SDK rolls, resulting in an unbootable combination of fresh and stale
build files.

This CL effectively implements a recursive "touch" on the SDK files,
which gives an unambiguous change signal to Ninja.

Change-Id: I6b5e15a2b4404fcc7a2f52ebf76f75f80a0a6605
Reviewed-on: https://chromium-review.googlesource.com/1025376Reviewed-by: Scott Graham <scottmg@chromium.org>
Commit-Queue: Kevin Marshall <kmarshall@chromium.org>
Cr-Commit-Position: refs/heads/master@{#553267}