Buck: Upgrade to the latest version
Buck: Upgrade to the latest version

The reason for upgrade is recently implemented feature: [1] to remove
output directory when switching between Buck versions. The structure
of the output directory can change between Buck versions, so this is
always needed step anyway.

[1] https://github.com/facebook/buck/commit/7e153d4a69044d059288d353fc1a442e07cbea58

Change-Id: Ifd2dcf69aa015e8eaf572820b5c5f53721dd19bd

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