[MacPorts] #59315: qt5-qtbase @5.12.5_3 +openssl: no binary and compilation failure on macos 10.12

[MacPorts]

#59315: qt5-qtbase @5.12.5_3 +openssl: no binary and compilation failure on macos
10.12
-------------------------+---------------------------------
  Reporter:  tenzap      |      Owner:  MarcusCalhoun-Lopez
      Type:  defect      |     Status:  assigned
  Priority:  Normal      |  Milestone:
 Component:  ports       |    Version:  2.6.1
Resolution:              |   Keywords:
      Port:  qt5-qtbase  |
-------------------------+---------------------------------

Comment (by MarcusCalhoun-Lopez):

 The problem seems to be that Xcode 9 [https://doc-snapshots.qt.io/qt5-5.12
 /supported-platforms.html is required].\\
 Your options are to:
 * upgrade to Xcode 9
 * downgrade to Qt 5.11
 I will try to write a better check in the Portfile.

-- 
Ticket URL: <https://trac.macports.org/ticket/59315#comment:3>
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