[MacPorts] #56930: podofo 0.9.6 won't build with cmake 3.12

[MacPorts]

#56930: podofo 0.9.6 won't build with cmake 3.12
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 Reporter:  grumpybozo  |      Owner:  (none)
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.5.3
 Keywords:  haspatch    |       Port:  podofo
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 Upstream ticket: https://sourceforge.net/p/podofo/tickets/24/

 Simple problem: cmake 3.12 no longer tolerates non-existent source in
 copy_directory, podofo tries to copy a non-existent directory
 Simple fix: Don't do that.

 Patch attached is from upstream ticket

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Ticket URL: <https://trac.macports.org/ticket/56930>
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