jlink error when building jextract on macOS for JDK 21

[Manuel Bleichenbacher]

As part of upgrading https://github.com/manuelbl/JavaDoesUSB to JDK 21, I'm
building jextract for JDK 21. It works without issue on Linux and Windows.
But on macOS it fails with this error message:

*> Task :createJextractImage* FAILED

Error: jdk.tools.jlink.plugin.PluginException: Duplicate resources:
{include/darwin/jawt_md.h=[jdk.compiler, jdk.internal.opt],
conf/jaxp.properties=[jdk.compiler, jdk.internal.opt],
include/jawt.h=[jdk.compiler, jdk.internal.opt]}

>From my limited understanding of jlink, I think one of the explicitly
specified modules has a transitive dependency to the module
"jdk.internal.opt", so it's included as well. But the modules
"jdk.compiler" and "jdk.internal.opt" have three common files, which are
now in conflict.

Is this a known issue? Is there a workaround?

My environment is:
- JDK for gradle: openjdk version "17.0.1" 2021-10-19 LTS
- JDK 21: OpenJDK 64-Bit Server VM Zulu21+69-CA (build 21-ea+28, mixed
mode, sharing)
- jextract: head of "jdk21" branch
- Command line: sh ./gradlew
-Pjdk21_home=/Users/me/Documents/zulu21.0.69-ea-jdk21.0.0-ea.28-macosx_aarch64
-Pllvm_home=/Library/Developer/CommandLineTools/usr/ clean verify
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