[MacPorts] #64037: openssl3: build failure on macOS 10.8

[MacPorts]

#64037: openssl3: build failure on macOS 10.8
---------------------+--------------------------
 Reporter:  mascguy  |      Owner:  cjones051073
     Type:  defect   |     Status:  assigned
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.7.1
 Keywords:           |       Port:  openssl3
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 I'm seeing the following build failure on my macOS 10.8 VM, with Xcode/CLT
 5.1.1:

 {{{
 SPECIFIC ERRORS - AND A COMPLETE ATTACHED BUILD LOG - TO BE ADDED SHORTLY
 }}}

 Note that updating the portfile to blacklist older Xcode clangs solves the
 issue.

 However, given that our 10.8 buildbot is running Xcode 5.1.1 as well - and
 builds succeed there - thus far I've chalked it up to quirks in my
 particular 10.8 setup.

 Also of note, this port builds successfully on every one of my other macOS
 VMs - including 10.6 and 10.7, as well as 10.9 through 10.15. It also
 builds successfully on my physical installations, for 10.12 through 10.15.

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Ticket URL: <https://trac.macports.org/ticket/64037>
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