[MacPorts] #45470: botan: needs revision update for universal builds

[MacPorts]

#45470: botan: needs revision update for universal builds
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 Reporter:  mcalhoun@…  |      Owner:  mww@…
     Type:  defect      |     Status:  new
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:  2.3.2
 Keywords:              |       Port:  botan
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 The build.h file merges incorrectly in a universal build due to nested
 comments.[[BR]]
 This is similar to #25439.[[BR]]
 A fix similar to r79694 should fix the problem.

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Ticket URL: <https://trac.macports.org/ticket/45470>
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