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Add a patch file detailing the changes to unrar that fixed linter warnings

This CL only includes the changes that made no functional changes to
unrar. If diffs from this patch file don't apply to new versions, it
shouldn't be very concerning.

Bug: 910302
Change-Id: I871307b441a73ba6ee55601ac2944df3eeff7705
Reviewed-on: https://chromium-review.googlesource.com/c/1357383Reviewed-by: Varun Khaneja <vakh@chromium.org>
Commit-Queue: Daniel Rubery <drubery@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612825}