[MacPorts] #55235: gnutls library links to libidn2 if installed

[MacPorts]

#55235: gnutls library links to libidn2 if installed
---------------------+--------------------
 Reporter:  tgyurci  |      Owner:
     Type:  defect   |     Status:  new
 Priority:  Normal   |  Milestone:
Component:  ports    |    Version:
 Keywords:           |       Port:  gnutls
---------------------+--------------------
 `gnutls` port depends on `libidn` port but links to `libidn2` if that port
 is installed.

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Ticket URL: <https://trac.macports.org/ticket/55235>
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