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build: reduce tarball size by 8-10%

Rodrigo Muino Tomonari requested to merge github/fork/jbergstroem/slimmer_tarball into v1.x

Slim the tarballs further by removing examples, documentation and test for third party libraries. Also switch to checkout-index versus archive so we avoid using tar.

"Verified" by using a generated tarball to configure, compile and test io.js.

Beyond this, it'll get tricker to further reduce the size. A few things to consider:

  • npm node_submodule tests: saves ~400k off the tarballs but I think this falls out of scope for what we should meddle with. (If at all) I'd prefer upstream doing this.
  • make bench-http requires tools/wrk which is bundled (3.9mb) but a lot of benchmarks also assumes ab is available. Perhaps drop wrk from our bundle and make the same assumption?

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