[MacPorts] #40228: cmake: add FindLua52.cmake

[MacPorts]

#40228: cmake: add FindLua52.cmake
-------------------------+-------------------------
 Reporter:  mojca@…      |      Owner:  css@…
     Type:  enhancement  |     Status:  new
 Priority:  Normal       |  Milestone:
Component:  ports        |    Version:
 Keywords:               |       Port:  cmake wxLua
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 This needs to be reported upstream, but it might take a while before they
 do anything and release a new version. {{{wxLua}}} needs
 {{{FindLua52.cmake}}} in order to compile with external dependency
 (otherwise it can still use the built-in lua, but not the external one).

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Ticket URL: <https://trac.macports.org/ticket/40228>
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