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Fuchsia test/exe runner was looking for symbols in exe.unstripped and
lib.unstripped directories. Files in these directories are no longer
generated, so the script would use outdated files left over from when
they were generated. Cleanup the script to ignore these directories.

Change-Id: Ic9d8ced326c3c2d83caf70e0ccea7df4af01c414
Reviewed-on: https://chromium-review.googlesource.com/834762Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Wez <wez@chromium.org>
Cr-Commit-Position: refs/heads/master@{#525224}