[MacPorts] #70419: libcryptopp: provide pkgconfig file

[MacPorts]

#70419: libcryptopp: provide pkgconfig file
--------------------------+-------------------------
 Reporter:  barracuda156  |      Owner:  raphael-st
     Type:  enhancement   |     Status:  assigned
 Priority:  Normal        |  Milestone:
Component:  ports         |    Version:  2.9.3
 Keywords:                |       Port:  libcryptopp
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 CMake does not find `libcryptopp`, since it installs neither config.cmake
 nor a pc file. Could we have one?

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Ticket URL: <https://trac.macports.org/ticket/70419>
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