Buck: Import all bucklets in bucklet.defs This means all bucklets used by Gitiles are loaded on every buck invocation. Arguably it's a performance hit if you try to build a target that doesn't require the bucklets, but for a small project like Gitiles where every rule requires loading at least one bucklet, the cost should be minimal. Inspired-by: Dave Borowitz <[email protected]> Change-Id: Ic1c8048437876b5bfd7cd503b32bd97649e4402c