[MacPorts] #69490: libressl cannot be installed when it depends on a clang port because it conflicts with openssl

[MacPorts]

#69490: libressl cannot be installed when it depends on a clang port because it
conflicts with openssl
------------------------+----------------------
 Reporter:  ryandesign  |      Owner:  artkiver
     Type:  defect      |     Status:  assigned
 Priority:  Normal      |  Milestone:
Component:  ports       |    Version:
 Keywords:              |       Port:  libressl
------------------------+----------------------
 libressl blacklists Xcode clang < 1001, so with Xcode versions earlier
 than 10.2, MacPorts will select a MacPorts clang compiler. But that won't
 work because MacPorts clang compilers depend on cmake which depends on
 curl which depends on openssl which conflicts with libressl.

 https://build.macports.org/builders/ports-10.8_x86_64-builder/builds/168292/steps
 /install-port/logs/stdio

 This would be resolved by uncoupling libressl and openssl as long
 suggested in #54744.

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Ticket URL: <https://trac.macports.org/ticket/69490>
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