[MacPorts] #67774: libgit2-devel @1.7.0: builds fail for 10.8 thru 10.12: use of undeclared identifier 'errSSLNetworkTimeout'

[MacPorts]

#67774: libgit2-devel @1.7.0: builds fail for 10.8 thru 10.12: use of undeclared
identifier 'errSSLNetworkTimeout'
----------------------------+----------------------
  Reporter:  mascguy        |      Owner:  mascguy
      Type:  defect         |     Status:  assigned
  Priority:  Normal         |  Milestone:
 Component:  ports          |    Version:  2.8.1
Resolution:                 |   Keywords:
      Port:  libgit2-devel  |
----------------------------+----------------------

Comment (by mascguy):

 Of note, upstream automatically disables use of `SecurityFramework` for
 10.7 and earlier, which is why builds succeed for those platforms.
 Presently the CMake files don't appear (?) to provide a formal option to
 do so, though it would be easy enough to patch one in.

 Let's see what upstream wants to do though, before moving forward.

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Ticket URL: <https://trac.macports.org/ticket/67774#comment:2>
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