[tor-bugs] #27738 [Core Tor/Tor]: Travis: use the homebrew addon to reliably install dependencies

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#27738: Travis: use the homebrew addon to reliably install dependencies
-------------------------------------------------+-------------------------
 Reporter:  teor                                 |          Owner:  teor
     Type:  enhancement                          |         Status:
                                                 |  needs_review
 Priority:  Medium                               |      Milestone:  Tor:
                                                 |  0.3.5.x-final
Component:  Core Tor/Tor                         |        Version:
 Severity:  Normal                               |     Resolution:
 Keywords:  029-backport, 032-backport,          |  Actual Points:
  033-backport, 034-backport                     |
Parent ID:                                       |         Points:
 Reviewer:                                       |        Sponsor:
-------------------------------------------------+-------------------------
Changes (by teor):

 * status:  assigned => needs_review
 * type:  defect => enhancement


Comment:

 See my branches bug27738-029 and bug27738-032 on
 https://github.com/teor2345/tor.git

 bug27738-032 merges cleanly forward into 0.3.3, 0.3.4, and master.

 The CI is here:
 * 029: https://travis-ci.org/teor2345/tor/builds/429961332
 * 032: https://travis-ci.org/teor2345/tor/builds/429964572
 * 033, 034, master: https://travis-ci.org/teor2345/tor/branches

 I also pushed the following branches, so I can compare build speeds and
 package versions without `brew update`:
 * before-bug27738-029
 * before-bug27738-032

 macOS builds now finish in about half the time (8 min vs 15 min, and 7-10
 min vs 13-17 min).

 Here are the package version downgrades:
 * openssl 1.0.2o_2 rather than 1.0.2p
 * zstd 1.3.4 rather than 1.3.5
 * ccache 3.4.2 rather than 3.4.3
 * asciidoc and xmlto always get installed, rather than only being
 installed when $ASCIIDOC_OPTIONS is set

 This change should also reduce the number of network accesses in our
 builds, making them more reliable.

 I also made a travis docs pull request to document the Homebrew addon:
 https://github.com/travis-ci/docs-travis-ci-com/pull/2023

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/27738#comment:1>
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