[MacPorts] #68278: openjdk17: missed dependency to libiconv

[MacPorts]

#68278: openjdk17: missed dependency to libiconv
------------------------+--------------------
  Reporter:  catap      |      Owner:  (none)
      Type:  defect     |     Status:  new
  Priority:  Normal     |  Milestone:
 Component:  ports      |    Version:
Resolution:             |   Keywords:
      Port:  openjdk17  |
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Comment (by ryandesign):

 Replying to [comment:3 breun]:
 > The pre-built JVM ports I maintain reference `/usr/lib/libiconv.2.dylib`
 instead of `/opt/local/lib/libiconv.2.dylib`, and no linking errors are
 reported when installing them on a system without the `libiconv` port
 installed,

 Naturally.

 > even though there is no `/usr/lib/libiconv.2.dylib` file on my system.
 >
 > But I also see `/usr/lib/libSystem.B.dylib` in the list of used shared
 libraries for both `openjdk17` and `openjdk17-zulu`, and I don't have that
 file on my system, but there are no link errors reported for that. I am
 not very familiar with how shared dylib files work though.

 Apple, in their wisdom, have decided to remove libraries and the library
 parts of frameworks from the filesystem as of macOS 11. They are now only
 in the dyld cache. So you cannot tell whether a library exists by checking
 if a file is there. The only way to know is to try to `dlopen` it.

-- 
Ticket URL: <https://trac.macports.org/ticket/68278#comment:4>
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