[tor-bugs] #31464 [Applications/Tor Browser]: meek and moat are broken on macOS 10.9 with the switch to Go 1.12

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#31464: meek and moat are broken on macOS 10.9 with the switch to Go 1.12
------------------------------------------+---------------------------
     Reporter:  gk                        |      Owner:  tbb-team
         Type:  defect                    |     Status:  new
     Priority:  Medium                    |  Milestone:
    Component:  Applications/Tor Browser  |    Version:
     Severity:  Normal                    |   Keywords:  tbb-rbm, meek
Actual Points:                            |  Parent ID:
       Points:                            |   Reviewer:
      Sponsor:                            |
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 When using `meek` and/or `moat` on macOS 10.9 one gets
 {{{
 dyld: Symbol not found: _unlinkat
   Referenced from: .../Tor
 Browser.app/Contents/MacOS/./Tor/PluggableTransports/meek-client-
 torbrowser
   Expected in: flat namespace
 }}}
 and the pluggable transport being non-functional. As I wrote in
 comment:36:ticket:30126:

 I suspect the underlying problem is a change in Go 1.12 where Go is
 starting to use `libSystem.dylib` etc. for syscalls:
 ​https://github.com/golang/go/issues/17490. (The mac-ports folks had to
 work around that e.g. in ​https://trac.macports.org/ticket/58138).

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Ticket URL: <https://trac.torproject.org/projects/tor/ticket/31464>
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