Updater: Attempt to fix nondeterministic builds.

By eliminating the copy and building directly into the bundle dir, we
avoid the undefined order of the copy vs link steps. (Note: it is not
sufficient to have the link step depend on the copy.)

Change-Id: I043b4ddb617e94cf8eb47d4a483002fef7bed89a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4341837


Reviewed-by: Noah Rose Ledesma <noahrose@google.com>
Auto-Submit: Joshua Pawlicki <waffles@chromium.org>
Commit-Queue: Noah Rose Ledesma <noahrose@google.com>
Commit-Queue: Joshua Pawlicki <waffles@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1118666}