Temporarily disable abi-diffing.

Prepare for Bug 62060883's fix, which changes the message format of
abi-dumps in a backward incompatible way.

Bug: 62060883

Test: make -j64 from ToT.

Change-Id: Id97438ec365ea51692e5a9d1b1f9cf154bd901cb
582 files changed
tree: 4b825dc642cb6eb9a060e54bf8d69288fbee4904

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