[MacPorts] #59196: popper fails to compile with XCode 11 on MacOS 10.14

[MacPorts]

#59196: popper fails to compile with XCode 11 on MacOS 10.14
--------------------+---------------------
 Reporter:  tk7r    |      Owner:  (none)
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.6.1
 Keywords:          |       Port:  poppler
--------------------+---------------------
 log file shows:

 clang: warning: no such sysroot directory:
 '/Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk'
 [-Wmissing-sysroot]

 XCode 11 is missing this location; actual content of ls -al
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs

 DriverKit19.0.sdk
 MacOSX.sdk
 MacOSX10.15.sdk

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Ticket URL: <https://trac.macports.org/ticket/59196>
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