MavenPublishPluginPlatformTest does not pass on Windows

[sschuberth]

There are multiple issues. E.g.

• something does not seem to properly close the files written to the local repository:

  Suppressed: java.nio.file.FileSystemException: C:\Users\SEBAST~1\AppData\Local\Temp\junit400498029000534319\repo\com\example\test-artifact\1.0.0\test-artifact-1.0.0-sources.jar: The process cannot access the file because it is being used by another process

• compilation fails with

  WindowsRegistry is not supported on this operating system.

  which is very weird, as I am running on Windows, so registry access (probably to find the Java toolchain) should work. Also WindowsRegistry is not supported on this operating system. gradle/native-platform#274 does not really give much of a clue.