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`data` entries that are directories are fine for directories in the source
tree, but in the build tree they cause incorrect incremental builds:
Consider a build step that copies a bunch of files into the build out dir.
At a later revision, it copies fewer files. Incremental bots will still have
the now-removed file sitting around, and due to the listed directory,
the stale file will be zipped up and sent to swarming.

For now, enable this check only on non-cros non-msan linux, on fuchsia,
and on iOS.

Add temporary whitelist entries for existing violations. (See patch set
17 for how some of them can be removed, but I'd like to land those in
separate CLs.)

Bug: 912946
Change-Id: Ia01d8e43f0256e3fcae39cb3e1529084d587bb7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1764392
Commit-Queue: Nico Weber <thakis@chromium.org>
Reviewed-by: Takuto Ikuta <tikuta@chromium.org>
Cr-Commit-Position: refs/heads/master@{#690235}