[MacPorts] #57308: libpftp fails to build on mojave

[MacPorts]

#57308: libpftp fails to build on mojave
---------------------+---------------------
 Reporter:  rlhamil  |      Owner:  (none)
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:  2.5.4
 Keywords:  mojave   |       Port:  libpftp
---------------------+---------------------
 :info:build /usr/bin/clang -r -keep_private_externs -nostdlib -o
 .libs/libpftp.0.0.6.dylib-master.o  pftp.lo pftp_directory.lo
 pftp_sfvcheck.lo && /usr/bin/clang -dynamiclib -flat_namespace -undefined
 suppress -o .libs/libpftp.0.0.6.dylib .libs/libpftp.0.0.6.dylib-master.o
 -L/opt/local/lib -lssl -lcrypto -lresolv -lc -headerpad_max_install_names
 -syslibroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk
 -headerpad_max_install_names -syslibroot
 /Applications/Xcode.app/Contents/Developer/Platforms/MacOSX.platform/Developer/SDKs/MacOSX10.14.sdk
 -install_name /opt/local/lib/libpftp.0.dylib -compatibility_version 1
 -current_version 1.6
 :info:build clang: error: unknown argument: '-syslibroot'
 :info:build clang: error: unknown argument: '-syslibroot'

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Ticket URL: <https://trac.macports.org/ticket/57308>
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