deterministic builds: Remove some now-unused code from compare script

- remove code that skips part of coff headers if timestamps are different;
  no longer an issue after #580585

- remove blacklist code; the blacklist is empty now

Bug: 314403
Change-Id: I3e6c1eea3fea321c63c4081002931eb8a4a7ca12
Reviewed-on: https://chromium-review.googlesource.com/1163177
Reviewed-by: Hans Wennborg <hans@chromium.org>
Commit-Queue: Nico Weber <thakis@chromium.org>
Cr-Commit-Position: refs/heads/master@{#580846}
2 files changed