capnp: vendor gtest

[dunn]

• Have you followed the guidelines in our Contributing document?
• Have you checked to ensure there aren't other open Pull Requests for the same formula update/change?
• Have you built your formula locally prior to submission with brew install <formula> (where <formula> is the name of the formula you're submitting)?
• Does your submission pass brew audit --new-formula <formula> (after doing brew install <formula>)?

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Fixes #5435.

[zmwangx]

CI is seeing the same test failure as I did:

The following tests FAILED:
      2 - kj-heavy-tests-run (Failed)

Only on Sierra.

[dunn]

Ohhh; I was testing on El Cap. Dang.

[dunn]

The release we're trying to build is so old that I don't think that test even exists in the current master: https://github.com/sandstorm-io/capnproto/tree/master/c%2B%2B/src/kj

[zmwangx]

Yeah as I said in the other thread, gtest was yanked out completely.

[zmwangx]

Unfortunately the master branch seems to also fail the same test: capnproto/capnproto#375. (I didn't test it locally because the formula might need substantial modifications to work with master — at least merely running ./release.sh doesn't work.)

[zmwangx]

@paulproteus, member of sandstorm-io (parent org of capnp), claims that it's not essential to pass all tests (if I understood him correctly). Guess we can yank out make check.

[dunn]

¯\_(ツ)_/¯ ok

[MikeMcQuaid]

Thanks @dunn!

[kentonv]

FWIW the test failures here appear to be because Apple shipped a broken kernel. The test failures are very real, but it's the OS that's broken. What does one do in such a case? :/

[zmwangx]

File a radar.