[MacPorts] #58138: go @1.12 fails to build on mavericks

[MacPorts]

#58138: go @1.12 fails to build on mavericks
---------------------+----------------------
  Reporter:  tehcog  |      Owner:  ci42
      Type:  defect  |     Status:  assigned
  Priority:  Normal  |  Milestone:
 Component:  ports   |    Version:  2.5.4
Resolution:          |   Keywords:
      Port:  go      |
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Comment (by kencu):

 This one may turn out to be interesting:
 {{{
 :info:build Building Go toolchain2 using go_bootstrap and Go toolchain1.
 :info:build dyld: Symbol not found: _unlinkat
 :info:build   Referenced from:
 /opt/local/var/macports/build/_opt_local_var_macports_sources_rsync.macports.org_release_tarballs_ports_lang_go/go/work/go/pkg/tool/darwin_amd64/go_bootstrap
 }}}

 The legacy-support port offers an implementation of that symbol:
 {{{
 $ nm /opt/local/lib/libMacportsLegacySupport.dylib | grep unlinkat
 00000000000027a0 T _unlinkat
 }}}

-- 
Ticket URL: <https://trac.macports.org/ticket/58138#comment:3>
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