[MacPorts] #72271: libffi 3.4.6 Fails because of changes to llvm

[MacPorts]

#72271: libffi 3.4.6 Fails because of changes to llvm
----------------------+--------------------
 Reporter:  TruePath  |      Owner:  (none)
     Type:  defect    |     Status:  new
 Priority:  Normal    |  Milestone:
Component:  ports     |    Version:
 Keywords:  llvm fix  |       Port:  libffi
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 See this [discussion](https://github.com/libffi/libffi/pull/857) on the
 libffi github about the errors.  The fix is as simple as switching to the
 3.4.7 in the config and updating the hashes.  I've attached the version of
 the portfile which does this so someone who has the git repo setup
 correctly can create a patch really easily

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Ticket URL: <https://trac.macports.org/ticket/72271>
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