[MacPorts] #50898: Box2d @2.3.1 Moved to github

[MacPorts]

#50898: Box2d @2.3.1 Moved to github
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 Reporter:  port@…  |      Owner:  macports-tickets@…
     Type:  defect  |     Status:  new
 Priority:  Normal  |  Milestone:
Component:  ports   |    Version:  2.3.4
 Keywords:          |       Port:
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 Box2d moved from google code to github, attached is a patch that updates
 the source and updates the Cmake to use the cmake.out_of_source building.

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Ticket URL: <https://trac.macports.org/ticket/50898>
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